No, Chalk is calcium carbonate (form of limestone), FRENCH Chalk is hydrated magnesuim silicate, as is Talcum. David. "John, In part you are correct in that French chalk falls under the category of a "talc" only in that it is a lubricant. Talcum powder is the loose form of hydrated magnesium silicate, whereas French Chalk is calcium carbonate. Different stuff for different uses, but maybe not in this case. Bruce Browning The Piano Tuner". -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090110/5847e8b3/attachment-0001.html>
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