1.1 ,This test method covers the measurement of refractive indexes, accurate to two units in the fourth decimal place, of transparent and light-colored viscous hydrocarbon liquids and melted solids that have refractive indexes in the range between 1.33 and 1.60, and at temperatures from 80 ,°,C to 100 ,°,C. Temperatures lower than 80 ,°,C can be used provided that the melting point of the sample is at least 10 ,°,C below the test temperature.