Wikipedia
Visualant
Visualant, Incorporated develops a spectral matching technology using a patented ChromaID approach. Founded in 1998, Visualant is a public company based in Seattle, Washington. The ChromaID technology shines LED wavelengths or laser light onto a material and measures the intensity of the light that is reflected back.. The data collected can be used to determine what the material in question is by detecting slightest variations in the pattern of the material's reaction to the structured light.