Halocarbon oils are shown to be a useful matrix for transmission spectroscopic studies of solid inorganic materials in the near-infrared and visible regions. Absorption spectra of these oils are flat and featureless between 5000 and 32,000 cm<sup>−1</sup>. The halocarbon oils are inert to virtually all types of inorganic substances at room temperature. Light scattering appeared to be reduced for the more viscous of two halocarbon oils investigated. Examples of the application of the halocarbon oil mull technique are given for three inorganic substances: chromium(III) potassium sulfate dodecahydrate, nickel(II) hydroxide, and silicotungstic acid.

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