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A 50 gram powdered sample of Laguna Barnard Slip substitute has been washed through 200, 150, 100 and 70 mesh screens. The raw powder is black, however that color washes away during screening revealing the base clay that is being conditioned by additions of black iron oxide or manganese dioxide containing materials (if they are seeking a close match to the original chemistry of Barnard).
| Materials |
SG 758
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