1. An apparatus for analyzing the absorption spectra of a sample, comprising a. a container for retaining the sample, said container including i. a carrier, ii. a sealed, hollow sample enclosure formed in the carrier, iii. means forming a transparent path through said enclosure, said path being transparent to both infrared and visible radiation, iv. a working fluid disposed within said enclosure, said fluid being transparent to infrared radiation, b. a source of tunable infrared radiation oriented to pass infrared radiation through said enclosure along said path, c. a visible light source oriented to pass visible radiation through said enclosure, and d. means for capturing and storing an image of a sample within said enclosure.