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Lead Test Paper

From a solu- root with ether; the filtered liquid is ready tion of either acetate or diacetate of lead; for use. The blue paper may be obtained used as a test for sulphuretted hydrogen and from the red one by dipping it in an aqueous hydrosulphuret of ammonia, which turn it solution of carbonate of soda of specific gravspecific gravblack. ity 1.5. A paper, answering for both alka-