FIELD: chemistry.
SUBSTANCE: invention relates to composition of a crude mixture which can be used in making smalt. The crude mixture for making smalt contains the following components in wt %: glass - 75.7-77.8; borax - 11-13; saltpetre - 4-5; cobalt carbonate - 0.2-0.3; cryolite - 5-8.
EFFECT: low melting temperature of the glass.
1 tbl
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