Cone 6: Purple Aster is a glossy, semi-opaque lavender glaze that breaks over texture and develops a pale violet frost; deep blue crystals melt into cascading blossoms of indigo. Cone 10: Color darkens slightly. No change to crystals. TIP: This glaze is fluid; Apply receding coats to avoid runoff on vertical pieces and practice caution in combination. Prone to pinholes when fired on manganese clay bodies.