Sunday, November 27, 2011

Bob's Crystalline Cone 10 RE

FRIT 3110 58.1
Zinc Oxide 24.6
Silica 17.2
EPK 0.5

+ Copper Carb. 3%

Evaluation: This glaze is a clear gloss glaze that is prone to crazing and is not stable. Works best when applied thickly to avoid bubbling. The bubbling could be due to over-firing or under-firing. The glaze works well with colorants but has the best results with 3% copper carb. This gives a molted green and red surface. I believe the green areas are where crystals are forming and the red areas are places where the glaze was heavily reduced.

The glaze was mixed in 100g batches. The test tile was dipped, while the cup had the glaze poured on. Both were fired to cone 10 reduction in a gas kiln.

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