At 06:56 +0800 10/1/09, Bruce Browning - The Piano Tuner wrote: >Talcum powder is the loose form of hydrated magnesium silicate, whereas >French Chalk is calcium carbonate. Whiting, whitening, or line chalk as Ron describes it, is calcium carbonate. French chalk is magnesium silicate whether in England or America, as the dictionaries and any search on Google will confirm. JD
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