This is a scrap of crepe fabric. The color is a subdued, gray-leaning purple, similar to shion (aster) or rindou (gentian) purple. I apologize that the color doesn't come out well in the photos, as my camera isn't very good. Searching for "rindou color" or "shion color" might help you confirm the shade. It's a subdued, Japanese-style purple, that kind of color. It didn't change with moisture, so I think it's likely a polyester fabric made for clothing, but the exact composition is unknown, so it's not suitable for those who are particular. 72cm wide x approximately 250cm