The CRM 610 series is comprised of several different chemical solutions sealed in fused silica cuvettes. Each chemical solution has its own characteristic sharp cutoff that allows stray light testing in a particular wavelength region. The chemical solutions include the following:
- Potassium Chloride
- Sodium Chloride
- Sodium Bromide
- Lithium Carbonate
- Potassium Iodide
- Sodium Iodide
- Sodium Nitrite
