"Conchoidal" Quotes from Famous Books
 ... puncture of a small insect—coccus ficus—made for the sake of depositing its ova on the branches of several plants, found in Siam, Assam, and Bengal. The twigs soon become encrusted with a mammelated substance of a red colour more or less deep, nearly transparent, hard, and having a brilliant conchoidal fracture. The roughly-prepared coating is imported in two forms, called lac-lake and lac-dye, which contain about 50 per cent of colouring matter, combined with more or less resin, and with earthy matters, consisting ...
— Field's Chromatography - or Treatise on Colours and Pigments as Used by Artists • George Field |
