A water-soluble solution of soda and silica traditionally used to deflocculate casting slips. Often used in conjunction with soda ash, it is equally effective in both high and low temperature slips. Care must be used when using sodium silicate because it will actually reflocculate the slip if too much is added. It is also readily absorbed by plaster, leading to deterioration and the eventual breakdown of slip casting molds.
In ceramics, sodium silicate can also be used in surface decoration to create a crackled surface texture on pots.
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