Although the colloidal mastic test, first introduced by Emmanuel,1 and later modified by Cutting,2 has been in limited use for several years, the question of its value as compared with that of the colloidal gold test is still an unsettled one. Considering the more complicated and uncertain methods of preparing the reagents used in the colloidal gold test, the simplicity and uniformity of the mastic reaction has much to recommend it. If it can be shown that the information provided by the mastic test is equivalent to that given by the gold test, or that the mastic test may in some cases provide information which the gold test fails to give, the test deserves wider use than is now made of it. In either case, the mastic test should prove of value not only when facilities for performing the gold test are lacking, but also as a check
KEIDEL A, MOORE JE. COMPARATIVE RESULTS OF COLLOIDAL MASTIC AND COLLOIDAL GOLD TESTS. Arch NeurPsych. 1921;6(2):163–172. doi:10.1001/archneurpsyc.1921.02190020046004
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