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Strontium Carbonate - 1 lb.
Strontium Carbonate - 1 lb.
SrCO3 (70.20% SrO) Strontium carbonate is often recommended as a substitute for barium to produce matte glazes. Use about 75% as much and test first to make sure color response is the same. However strontium is not a substitute for barium as a precipitator of soluble salts in clay bodies because it combines with SO4-- ions in the water to form a compound that is not nearly as insoluble as BaSO4. Viscous zirconium silicate glazes can be smoothed with the addition of strontium carbonate. Strontium is considered a safe material. Some people confuse SrO with Strontium 90, an isotope released from atomic reactions, but they are not the same thing. Strontium carbonate produces gases as it decomposes and these can cause pinholes or blisters in glazes. There are many strontium frits available and incorporating one of them to source the SrO instead is a classic application of ceramic chemistry calculations. The resultant glaze will be more fusible and will have better clarity and fewer defects. Source: Digital Fire.
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