|Monthly Tech-Tip |
Modified: 2022-10-13 21:48:49
Cone 9-10 - Spodumene, talc variant
|Ferro Frit 3110||50.00|
From Crystal Glazes Book 2 by Fara Shimbo, page 63.
Maturing Cone: 9-10
Crystal number: Plenty! Can rapidly fill a tile.
Rate Of Growth: 1-1.5 cm diameter per hour, tiles or vessels.
Crystal Color: Pale aquamarine, reminiscent of Michigan Celestite crystals.
Crystal Shape: Cigar-shaped normally; not much variation with temperature.
Ground Color: Colorless transparent on both tiles and vessels.
Crazing: Minimal on vessels; more on tiles.
Color Response: Works well with all colors. Brings out red in manganese; copper comes out a true cyan. Iron and Vanadium often pale.
Seeding properties: Okay.
More information in Crystal Glazes book 1 page 138 and book 2 on page 63. Much more background information in other sections of the books.
Freshly made Celestite Base applied to Jiki porcelain and fired to Δ10. Soaked for one hour beginning at 300° C F below peak, rising to 200° below peak, then falling over two further hours to 300° below peak.
Freshly made Celestite base with 4% copper carbonate added. Crystals are often more blue than the ground. Fired to Δ10.
Shimbo Crystal Celestite Schedule
Five-step schedule by Fara Shimbo
Crystalline Glaze Recipes Fara Shimbo
These are from Fara's Crystal Glazes books 1 and 2. Most are the frit 3110, zinc, silica base recipe (50:25:25) with small material additions at the expense of silica.
GBCG - Generic Base Crystalline Glaze
Cone 6-10 - Almost all other Frit 3110 recipes are based on additions to this
|Glaze Color||When Celestite crystalline glaze is used immediately, crystals are often a pale aquamarine even when no actual colorant is added. Copper in small amounts is influenced toward turquoise or cyan.|
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|By Tony Hansen|
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