I'm working on a gift for this Saturday, I am so close to being finished! I went to iron the piece and all the yellow material now has silver on it. I checked my iron there doesn't seem to be anything there, all the other fabrics are fine, but now I don't know what to do. It doesn't look like something that would wash off. It almost looks like it was a reaction between the material and the iron. I did prewash it, but I didn't iron it before using.