Scenery Workshop has new crushed glass powder for your modeling needs.
From the release:
Scenery Workshop (NL) is proud to present Crushed Glass Powder in its webshop. No more yellow snow, no more dull white stuff, but nice not TOO sparkly white snow. Depending on the amount of PVA glue or Water Resin you add it gets more wet or dry snow. Just add an extra layer of crushed glass powder to the surface to make it a bit extra sparkly!