I thought this fabric was silk, but now I’m not so sure. It may be nylon. It has interesting ridges in it, and is another American Players’ Theatre costume material swatch. Swished some acrylic paint on it to see if it would create a nice “ghost” image on the paper below it, like the silk did. Not really. So, I’ll try again with silk some day soon. I like the ghost images almost as much…but they’re pretty light and don’t show up on photos very well. 3.5″x10″