CO-21 Galactic GlacierCO 21 Galactic Glacier is a highly fluid light blue glaze with iridescent crystals that flash pink, violet, and silver. Apply to: Cone 04 Bisqueware Number of coats: 4 coats For best results, leave the inside or back of the form unglazed. Can be fired in a normal medium speed firing with no special cooling schedule required. To take this glaze to the next level, use a controlled cooling schedule for increased crystal growth These glazes are prone to