Yes, it's rayon. I'm thinking "Viscose" is a brand name of rayon, like DuPont's "Antron" was a trade name of one of their nylons. Rayon is a natural product, by the way, not a man-made one. Look up in Wickipedia, and get some coffee, that darn Wickipedia can be so interesting you'll get lost there for hours! Hugs, Marji