[Jewelry making - Article 00200] - Re: [Orchid] Water Glass

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    Sodium silicate was commonly used as a binder for casting mediums
    such as fine sand. It is hardened by carbon dioxide.  A 3% mix with
    fine sand and passing CO2 through the mould will instantly harden the
    mould ready for casting. It is one of the main constituents of air
    setting cements and mould/ingot wash. 

Am I showing my age here ?
all the best,
Terry


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