Archived certificate, issue date24June2009, Standard Reference Material1922, Liquid Refractive Index - Mineral Oil. Page1 describes a precision spectrometer-goniometer, minimum-deviation measurements, an oil-filled hollow prism, water-bath temperature control and tests on multiple aliquots. Page2, Table1 gives wavelength-specific values at20degrees Celsius, temperature coefficients and expanded uncertainties with coverage factor2;589.3nm value comes from fitted dispersion data. Used as a historical physical reference-material example, without a current-availability or current-certificate claim.
Additional locators in the archived 2009 certificate: p. 1, multiple-aliquot homogeneity tests and conditional certification validity; p. 3, original bottle, tight recapping, ambient storage and protection against excessive moisture and light.
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