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CERAMIC CHEMISTRY. Glaze too fusible. Not fusible enough. Right. Crazed. Add flint, or sub- Add spar, [or Replace clay by stitute PbO or BaO for CaO or Na 2 O. substitute B 2 O 3 for Si0 2 .f] flint and spar or alkaline earth bases by ZnO or add flint to body. Peeled (Not likely to Substitute flint Add clay or re- occur. ) Replace spar by clay [or B 2 O 3 by Si0 2 .t]