The most suitable set of liquids for general identification work is the Cargille set of Certified Refractive Index Liquids (HD 1/2). This comprises 31 liquids ranging from 1.500 to 1.800 at intervals of 0.010. A smaller set of the same high dispersion liquids consists of 16 liquids ranging from 1.500 to 1.800 at intervals of 0.020 (HD 16).
For specialised analysis, eg. the identification of commercial asbestos minerals, set HD 6 is required. This consists of six high dispersion liquids: 1.550, 1.580, 1.605, 1.640, 1.670 and 1.700.
Please ask for a detailed list of liquids available.