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care of food grade wood stuff

posted 15 years ago

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organic care of wooden spoons, cutting boards, etc.

In a nutshell:

go easy on the soap

not dishwasher safe

do not set in the kitchen sink

a few times a year, rub with walnut oil!

now for the verbose details

I live with a lot of other people and I share my wooden spoons, wooden cutting boards, wooden spatulas, wooden bowls and a variety of utensils with wooden handles ... a whole lot of wood stuff used in the kitchen with food.

A while back, some of my wooden ware was starting to crack and look a bit worn and a rather helpful woman pointed out the they needed proper care. So she popped out and bought "mineral oil". What the hell is "mineral oil"? So I researched it thinking that she was about to put something toxic on the stuff I put my food on.

Well, it turns out that mineral oil is a pertroleum product. Exactly like the stuff used in cars. Only completely different.

While it is considered to be something safe to ingest, it is also recommended for use as a laxitive. And, frankly, I just don't like the idea of eating petroleum products.

So I went on my of my obsessive research journeys.

The next most popular thing to use is linseed oil (flax seed oil). Some versions of it are laced with nasty chemicals. Other versions go rancid. My research shows one or the other and nothing in between. I don't want to eat nasty chemicals and I don't want to eat something rancid.

I found a lot of support for .... using nothing! It's free. It's easy to apply. It works pretty good. I have to admit, I am powerfully tempted by this idea. I suppose you could find that some pieces crack and you could just say "that stuff was crap anyway" and then you end up with a lot of good kitchen wood that never needs any oil. Not a bad strategy. My only real concern here is that when you live with other people, sometimes they put wood stuff in a funky kitchen sink - which makes me CRAZY as I imagine all sorts of gross things getting into my lovely wood (shudder). And if I had been oiling the wood once in a while, it seems like it would help me to get less freaked out when I find that somebody has done the funky sink trick. Plus, sometimes I have a wood thing that I really like and I don't want it to crack.

Until this investigation, I had never heard of tung oil. Wow! What a an amazing finish! It apparently comes from a "tung tree nut". While the finish is amazing looking, it apparently takes a lot of work - including getting the first few applications to penetrate the wood - which could involve stuff like turpentine! (ick!) .... and I'm not too sure about how edible/food safe this stuff is.

While I find a lot of people using all sorts of edible oils and saying "works for me" I have to wonder about if this stuff turns rancid and they don't seem to notice - or maybe it doesn't bother them. I wonder if they get colds easily - and if they were to switch out their woodenware and not treat it if they would not get colds as often. Just a thought.

Walnut Oil

Now we're talking!!! Walnut oil polymerizes when it comes into contact with the air. "Polymerize" is a word I've been studying a lot lately with my research on seasoning cast iron. This is where a liquid oil gets its molecules re-arranged into something hard and inert - rock-like. Paint-like. It is still the same edible molecule. If you bust off pieces, you can eat it. Most oils will polymerize with heat and time (the seasoning process of cast iron). Some oils make a stronger surface than others. Walnut oil may not be the best choice for cast iron, but according to my research, it is the best choice for woodenware. Once polymerized, it cannot turn rancid. All you need to do is buy a little walnut oil and rub it on. Warming it slightly first will help it to penetrate the wood.

It can be a little tricky to find, but never fear! Here is a link to some good walnut oil.

I've now been oiling my wood a few times a year with walnut oil and it has worked out really well.

COMMENTS:

Marilyn Queiroz

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posted 15 years ago

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I read a study one time on wood cutting board vs other types (plastic, for example). People thought the plastic would be easier to keep clean, and thus, safer. But it turned out that the wood cutting board actually tested out to have less bacteria. It appeared as though the wood had some sort of "antibiotic" properties.

I wonder if coating the wood with oil, wax, etc. might diminish that property.

Pennie O'Grady

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posted 15 years ago

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Hadn't thought much about rancidifying oils on woodenware, quite frankly, though I did opt out of mineral oil years ago upon realizing what it is. Now that I'm reading this, food oil certainly seems worth considering. Just for the record, I have used olive oil all along, though a thin coat as infrequently as possible (once a year or so?), We are 2 adults and 2 kids (now 15 and 13) and we get light colds about twice a year.

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posted 15 years ago

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I've talked to someone who recommended dipping food grade wood in molten beeswax as a solution. From personal experience any time you're dipping anything into molten wax of any kind you should: a; use a double boiler, b; have a fire extinguisher on hand, c; not walk away from any part of the process. Newsprint works to lay the dipped product down on, and you can then use it as a fire starter as most wax is flammable. Stearic acid can be used to raise the melting point of many waxes, but it can also raise the melting point to too near the flash point for comfort (said college age friend luckily had time to clean the most visible surfaces in the kitchen before his folks got home).

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posted 13 years ago

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I set a child down with all the wooden utensils once or twice a year and a bottle of olive oil and have her massage it into all of them (and her hands) while watching TV. Most of my utensils are olive wood.

I mix beeswax and olive oil to polish our unfinished (or no longer finished) wood. Doesn't hold up so well on a boat on salt water (just the trim, all above water line!) but holds up for months indoors.

To mix in solids you need them at same temp as all ingredients so I heat olive oil and beeswax in two separate metal bowls in same pan water then mix them to get my pasty at 70F beeswax/olive oil combo. DO NOT TRY WITH LINSEED OIL I presume. I have put beeswax shavings into linseed and other oil and all you have is shavings floating in the liquid which do not get into wood until melted by your fingers trying to rub the gook in.

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posted 13 years ago

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Wouldn't olive oil turn rancid?

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paul wheaton

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posted 13 years ago

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paul wheaton wrote:
Wouldn't olive oil turn rancid?

To rephrase. I'm pretty sure olive oil will turn rancid, so it probably shouldn't be used.

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Leah Sattler

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posted 13 years ago

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I'm pretty sure it would turn rancid also. olive oil doesnt' even keep that great in the pantry. turns funky after a while. I don't have any wood utensils at this time...I erally like maintenance free things......but I'm curious. would straight vit E work? it is added to products to increase shelf life so maybe it would be good for wood?

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Jocelyn Campbell

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posted 13 years ago

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Olive oil - I buy in bulk and keep most of it in the fridge. I keep a small amount in a bottle by the stove which I use up quickly so it doesn't go rancid. Surprising how many people don't know olive oil can go rancid. That goes for whole grains, too--especially brown rice.

Paul certainly does his research. Currently, I use the free, cheap, no oil version. Though one of these days I will try the walnut oil idea.

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paul wheaton

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posted 13 years ago

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I mashed this stuff into a new article at http://www.richsoil.com/wooden-spoon-care.jsp

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posted 13 years ago

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I've put my wooden spoons and slotted wooden spatulas thru the dishwasher for years. None of them have cracked. I use 7th Generation liquid auto dish detergent. Am I lucky or ignorant or both? I have a few chips and some burn marks but no cracks. I love wood cooking utensils. So what do you do to keep your wood utensils clean besides oiling them with walnut oil - handwash them? ?

paul wheaton

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posted 13 years ago

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I wash them by hand and try to minimize the time they are exposed to water.

Wow - a dishwasher ... Do you use the drying cycle? Do you oil your wood?

I would think that the super hot water would really pull the oils out of the wood.

So .... I'm surprised you are not having problems. The water in your washer does get super hot, right?

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posted 13 years ago

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I assume the water is really hot and I use the dry cycle and I have never oiled the wood. Maybe they are made of really good wood. maybe it's because the auto dish detergent is 7th generation. maybe it's because my wooden utensils know I love them.

I do not even remember where they came from I have had them so long.

But I will start oiling them now. What Walnut oil do you use ( brand)?

paul wheaton

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posted 13 years ago

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I have used two different brands so far. As long as it is organic, I'm not worried about brand.

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posted 13 years ago

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thanks for the info and down the road a ways I'll let you know how it works out- I saw some walnut oil today in Publix but it said made from roasted walnuts and I was not sure whether that is what I should be getting...

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posted 12 years ago

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Lee Valley Tools in Canada is a very good source for wood oils.
> Please, follow the link below and see the Annual Catalogue:

http://www.leevalley.com/Home/OnlineCatalogs.aspx?c=1

**BeeMc

Joel Hollingsworth

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posted 12 years ago

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I use walnuts, in the style of an oil pastel. They squish and grind to a pulp as they're rubbed against the wood, more so the rougher the wood is.

Rancidification is the same thing as curing. It smells the way it does because the linseed or walnut or tung or clove etc. oil is going through chemical changes that make it a solid, insoluble polymer. The whole point of adding walnut oil is that it will quickly "dry" (aka "cure", aka "go rancid"), leaving an inert, non-toxic coating.

Any odor was gone long before I noticed it. It is potentially a problem for a good friend of mine with life-threatening nut allergies, but I don't serve her food that's touched wood.

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posted 12 years ago

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Thanks! Now I know the point, and I have walnuts, so I'll give it a go! The spoon/cutting board has to be "cured" before it is used?

Joel Hollingsworth

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posted 12 years ago

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It cures over the course of about a week. Last time, about a year ago, if I had to wash something before it seemed fully cured (i.e., there was noticeable liquid oil), I sometimes put another light coat of oil on right after it dried.

paul wheaton

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posted 12 years ago

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Joel,

You're going in a direction that is warping my brain.

Polymerizing oil is the same as oil turning rancid?

I know that this is what you just said .... and I could see it being true ... I guess I am riddled with doubt and am hoping that you will say magic words to help me understand it better.

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Joel Hollingsworth

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posted 12 years ago

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Quite often, especially in the case of biological substances, polymerisation releases something as it occurs. Silicone caulk releases acetic acid as it cures (hence the vinegary smell), and your ribosomes release water as they string amino acids together into strands of protein.

In the case of drying oils (linseed oil is a good example, but raw, expeller-pressed canola is a "semi-drying" oil...more on that later), omega-3 fatty acids react with one another to become a solid mass of linoleum, or a priceless artistic masterpiece, or a disgusting skin on your bottle of oil. And the reaction overall releases a range of strong-smelling chemicals, depending on what sorts of fatty acid, and which of several reactions each one participated in.

In a bottle of oil, these chemicals build up, and the smell becomes unpleasant. Even if it's open to air, the reaction takes a while, because there's such a great depth of oil. The half-polymerized oil might not be very good for you (although conjugated linoleic acid can be good for you, so like everything else, it's complicated). Food processors strip the omega-3s out of any oil they sell ("deodorized" canola), or choose species that don't produce much, to prevent this from happening.

In a painting or an oiled piece of wood, the oil coats every fiber or speck of pigment, and has a very large surface area, so the reaction happens quickly. Thick impasto on some paintings takes decades to cure through its depth, but with a thin coat, the reaction is done and the smell has dissipated after a reasonably short time.

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posted 12 years ago

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Joel,

I never would have known this. Thank you for taking the time , here, to explain it!

So, if you use the the walnut itself, all the reactions take place on the surface of the wood instead of in the bottle of oil?

Elenafea

Joel Hollingsworth

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posted 12 years ago

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Some of these reactions start as the walnut is forming on the tree. They're slow, but are part of the reason good walnuts are expensive: they have a short shelf life. A living nut, though, with the shell intact, will last pretty well, maybe better than a hulled nut packed in a plastic bag filled with nitrogen.

Stale walnuts, that have begun to taste rancid, will be roughly equivalent to old-fashioned boiled linseed oil. A bottle of oil that has begun to turn would also be perfectly appropriate for wood care, perhaps slightly more so than a fresh one.

The main reason I use whole nuts is that they come in a convenient, single-use package.

Oh, and you're very welcome. Explaining things is one of my favorite activities, some say too much so...

Speaking of which:

Modern-day "boiled" linseed oil isn't boiled at all, it just has some metal catalyst particles mixed in. These make the reaction happen faster. I think black iron oxide is the catalyst they use most often, but most oxides work. This is another aspect of oil-based paint: that thick impasto wouldn't cure even as quickly as it does, without the action of pigments on the oil.

Another common strategy food packagers use against rancidity is to mix in disodium EDTA. EDTA is also used in chelation therapy, for the same reason: it binds to metal ions, and tends to be more fond of the more-toxic ions. It is the antidote to metal catalysts, in other words: mixed into "boiled" linseed oil, it becomes ferric EDTA or ferrous EDTA, and the catalyst particle is isolated from the oil.

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posted 12 years ago

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having fun this week with walnuts on wood cutting boards and utensils, will report results in a week ..I get walnuts in the shell in the fall when the new crop shows up around Thanksgiving- I find they last a month or more. Have wondered if putting them in the freezer in a sealed container would help preserve them? About nitrogen packed walnuts-
or nitrogen packed anything- I was told years ago nitrogen packing destroys enzymes. In your understanding, is this true?

Sorry to get way off topic here, but when you mentioned
EDTA, I wondered if you have any thoughts on powdered zeolite. We have jet & auto fall out in the Tampa Bay area and a friend recently had her dogs tested for heavy metals - the tests came back "off the charts." It actually had not occurred to me before, but our pets- cats esp ecially hang out under cars walk on the ground and in cleaning ingest probably more than people do of environmental heavy metals. I started giving my own brood powdered zeolite because I really couldn't find anything anywhere that would suggest not doing this.

Sorry Paul, I know this is way off topic, but just had to ask Joel if he has any thoughts on zeolite while I can...

Joel Hollingsworth

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posted 12 years ago

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Freezing definitely helps walnuts stay fresh, in my experience. Everything happens slower in the cold. And a good seal helps, but that's mostly an odor thing: walnuts are oily enough that the dryness doesn't seem to harm them.

Nitrogen shouldn't destroy the enzymes at all. It's used because it is so inert. I could imagine slightly fewer enzymes in food that's been stored for an extremely long time, and that long storage was made possible by packing in nitrogen...but anything that might keep for so long will be dormant, such as an un-sprouted seed, and those sorts of food aren't a great source of enzymes to begin with. But they make enzymes very vigorously if brought out of dormancy.

I tend to trust my own glands and gut flora to produce enough enzymes in most cases, and fermentation cultures in almost every other case. Or maybe you mean something different by the word "enzyme," in which case what I've said might not apply.

I mostly encounter zeolites in an entirely different context, and don't have much of an opinion about internal use to treat heavy metal exposure. I'd be careful about breathing them in.

Sadly, few other mammals live as long as we do, so some of the problems we develop from heavy metal exposure might not have time to develop in pets. I think making sure there's enough calcium in their diet would help a lot, whatever other measures you take.

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posted 11 years ago

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I just got an old used butcher block with legs. Do I need to sand the top and then cure it with walnut oil or will just cleaning it with soap and water really good them disinfecting it with a diluted clorox solution be enough before oiling it? The top is smooth with no cut marks.

Joel Hollingsworth

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posted 11 years ago

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I'd disinfect some way other than chlorine bleach. Strong oxidizers are bad for wood, and chlorine sometimes reacts to form scary long-lived toxins.

Maybe steaming it with a clothes iron, if you're really worried. Lemon juice is not a bad disinfectant, either.

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Location: Nashville, Tennessee, USA

posted 11 years ago

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May I suggest using certain woods for these purposes:

1) White Oak heart wood (the inner dark part of the log)
2) Osage Orange wood, it lasts 100 years underground and is the strongest wood found in N. America.
3) Cherry heart wood
4) Persimmon heart wood

For coatings on my newly made furniture I use veggie oil.
It works fantastic and never smells badly.
The dog chewed it once when encouraged by a small child.

Food grade Flax oil is good but I would not use "lindseed oil" (same thing) because they can denature it.

Walnut has a naturally occuring herbicide called Juglone in it that is toxic to humans at some dosage.

Much of the wooden ware floating around seems to be a chinese variety of wood.

These woods all grow around me in TN, USA and are substainably harvested our of peoples yards. We save the logs from landfills.

We live in Nashville, Tennessee, USA
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posted 11 years ago

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Any thoughts on using walnut oil on an unfinished maple dining table?

T. Joy

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posted 11 years ago

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Coconut oil supposedly doesn't go off. Neither does moringa seed oil.
I just bought some bamboo utensils, they seem very unfinished to me so maybe the kids and I will rub them with walnuts this week. It will be a good fun activity in any case, thanks for the suggestion

Jack Shawburn

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posted 11 years ago

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Garyd - If you know a woodworker with handplanes ask him if he could plane the surface of the butcher block .
Guys with handplanes mostly can sharpen the blades "scary sharp"
A butcher block could be refurbished this way.

Suzy Bean

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posted 11 years ago

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Feel free to elaborate on the appropedia page on organic care of wooden spoons and cutting boards ( http://www.appropedia.org/Organic_care_of_wooden_spoons,_cuttingboards,_etc . It currently has a very concise summary of how to care for things.

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posted 11 years ago

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garyd wrote:
I just got an old used butcher block with legs. Do I need to sand the top and then cure it with walnut oil or will just cleaning it with soap and water really good them disinfecting it with a diluted clorox solution be enough before oiling it? The top is smooth with no cut marks.

Steam and sunshine are both good disinfectants that will not leave a residue.

Emerson White

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posted 11 years ago

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Polymerization, is is not the same as the molecules reorganizing themselves. When you form a polymer the molecules stick to each other and become bigger longer molecules, they are no longer the same molecules. Most things only get safer when they are polymerized, but not all.

paul wheaton

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posted 10 years ago

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Lifehacker just made a big link-a-roonie to my article about caring for kitchen wood.

http://lifehacker.com/5836790/protect-w ... walnut-oil

this is the third time this summer that lifehacker made a huge link to something of mine.

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s starr

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posted 9 years ago

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As for wooden spoons and such one can oil it with coconut oil also as it doesn’t go rancid .

Cyndi Hull

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posted 7 years ago

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s starr wrote:As for wooden spoons and such one can oil it with coconut oil also as it doesn’t go rancid .

I think I will have to go with the coconut oil option as well as my husband is deathly allergic to walnut oil. Hopefully it will work as well as the walnut.

~hugsnprayers~ Cyndi

Charlotte Gibson

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posted 6 years ago

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Question about wooden spoons and cutting boards...............When they are wood burned are they food safe? AND does anybody know if the commercial ones you buy (quite inexpensive) are truly food safe?
Thanks.

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