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  1. Hi Quick question, its been bugging me all night. Took my test tiles out yesterday my black glaze has turned grey, why?? Technical information as follows: Bisque fired red terracotta clay to cone 1 (1138 Celsius) Glaze colour matt black (1020 -1100 Celsius)mixed from powder form 500grams to 608mls water, measured gravity 40 on hydrometer scale (light cream consistency) Dipped test tile for 6secs Slow glaze firing cone 03 to 1088 Celcius. Did 6 different colours also same firing temperature as matt black(1020-1100 range) the pastel green has turned yellow orche , brownish when overlapped with white...... (p.s colours well well mixed for 2mins and mixed again when dipping each test tile for 6 seconds) Should I change the gravity to 50 or is the red clay overpowering the colours hence changing them???
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