Sand mixed with potash and heat coalesced into pearls of water glass. Silica fibers are fibers made of sodium silcate (water glass). The binder is a combination of silica sol and water glass. Keim depended on V. van Baerle as the source of water glass. Silica sol method costs more but has the better surface than the water glass method. I of Bavaria was a time of intensive research into water glass (potassium silicate). These paints use potassium water glass as binder. The water glass binding agent is highly resistant to UV light. Material treated with plastic or water glass is termed "bonded" or "stabilized" turquoise. Without Lieberman's knowledge, Madison manages to identify him by his fingerprints on a water glass. They are also called water glass paints or Keimfarben (after the inventor). A water glass experiment (known at least since 1920, cf. Instead, Readick did, using a water glass next to his mouth for the echo effect. They come in prill (solid beads) form, as well as the liquid, water glass. Water glass is a useful binder of solids, such as vermiculite and perlite.