CHAP. 22.—SANDARACH.
According to Juba, sandarach and ochra are both of them productions of the island of Topazus,[1897] in the Red Sea; but neither of them are imported to us from that place. The mode of preparing sandarach we have described[1898] already: there is a spurious kind also, prepared by calcining ceruse in the furnace. This substance, to be good, ought to be of a flame colour; the price of it is five asses per pound.