AMACO CO-21 Galactic Glacier crystalline glaze

AMACO Cosmos Galactic Glacier creates a cool blue surface with pink-violet flashes, while its crystals resemble light trapped deep inside a frozen glacier.

Galactic Glacier is a highly fluid, light blue glaze with a glossy surface. It develops iridescent crystals that flash pink, violet, and silver. As it flows, the color can shift from frosty blue to an almost periwinkle-lavender hue. On AMACO's sample tiles, firing near 1200°C produces a finer, denser crystal pattern, while firing near 1240°C gives larger, more widely spaced crystals.

AMACO Cosmos

AMACO Cosmos is a range of highly fluid crystalline glazes for firing between 1200 and 1240°C. In a standard firing, they develop opalescent microcrystalline surfaces with depth, movement, and pronounced variation. No special firing schedule is required. Controlled cooling can, however, encourage more pronounced crystal development.

Brush the glazes onto clean, dry bisque-fired ware in 3-4 generous coats. AMACO recommends four coats for a fuller crystalline effect. These glazes are highly fluid, so stop application approximately 1.5 cm above the foot or use a drip tray to catch runs. To support off-gassing and reduce pinholing and blistering, leave the inside or back of the form unglazed. The final result depends on application thickness, clay body, firing temperature, and cooling cycle, so we recommend firing a test tile.

The glazes are labeled food safe. However, because of the limited durability of the fired surface, AMACO does not recommend them for food-contact surfaces. They are best suited to decorative ceramics, sculpture, tiles, and ceramic jewelry.

Amaco Cosmos CO-21 Galactic Glacier Crystalline Glaze

• Creates a glossy light blue surface with iridescent crystals flashing pink, violet, and silver.
• On AMACO's sample tiles, firing near 1200°C gives a finer, denser pattern, while firing near 1240°C produces larger, more widely spaced crystals.
• The crystalline effect develops in a standard firing. Controlled cooling can encourage more pronounced crystal development.
• Apply 3-4 generous coats to bisque-fired ware. AMACO recommends four coats for a fuller effect.
• The glaze is highly fluid - leave approximately 1.5 cm unglazed above the foot and protect the kiln shelf from runs.
• Best suited to decorative ceramics, sculpture, tiles, and ceramic jewelry.
• Labeled food safe, but AMACO does not recommend it for food-contact surfaces because of the limited durability of the fired surface.