The method of analysis is the refractive index which is measured by an Abbé-type refractometer at a wavelength of 589,3nm at 20°C and 25°C. Stable solutions have a minimum shelf life of 3 years, this kit is supplied ready to use.
Please see the technical sheets below for more information:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/218/670/specification-108961-refractive-index-standard-kit-2-20140224.pdf




