This section is from the book "The Engineer's And Mechanic's Encyclopaedia", by Luke Hebert. Also available from Amazon: Engineer's And Mechanic's Encyclopaedia.
Powders so finely levigated, that the particles of which they are formed cannot be distinguished by the senses, more especially that of feeling. Fine pigments, prepared by a flat stone and muller, are reduced to this state.
 
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