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Glaze for Porcelain

Feldspar, 27 parts; borax, 18 parts; Lynn sand, 4 parts; by experience. The fusion must be carefully nitre, 3 parts; soda, 3 parts; Cornwall china- conducted and continuous, and the melted clay, 3 parts. Melt together to form a frit, mass allowed to cool very slowly, after having been left in the fire for 24 to 30 hours at to form a frit, mass allowed to cool very slowly, after having and reduce it to a powder with 3 parts calcined been left in the fire for 24 to 30 hours at borax.