bleaching, guttapercha defined in 1909 yearbleaching, guttapercha - Bleaching, Guttapercha;
bleaching, guttapercha - Dissolve in 20 times its weight of boiling benzol, add 1/10 part plaster of very good quality, and agitate occasionally. By reposing for 2 days, the plaster is deposited and carries with it all the impurities not soluble in benzol. The clear decanted liquid is introduced by small portions into twice its volume of 90 per cent, alcohol, agitating continually. During this operation the guttapercha is precipitated as a pasty, perfectly white mass. The subsequent desiccation of the guttapercha requires several weeks' exposure to the air, but is accelerated by trituration in a mortar.
near bleaching, guttapercha in Knolik
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