Is Paul OK with small quantities of Borax? Doing a final rinse of fabric with some borax in the water will discourage mold. I wouldn't want to do that with something I was wearing, but drapes are another matter!
At the Lab, we try to use almost exclusively natural materials and to exclude glues, paints, almost all plastics and synthetic materials, etc. There is a tiny bit of latitude here when really necessary, but not much.
Jennifer Richardson wrote:I am also looking at this metal tension rod to hold the window quilts tight inside the frame with no gaps: