If you want to show that your active ingredient is deposited onto the hair cuticle or penetrates more deeply into the fiber, you may consider active ingredient delivery studies.

Both FT-IR spectroscopy and Raman spectroscopy enable us to visualize the distribution of a particular molecule or ingredient on the hair cuticle or in a hair cross-section.  The key advantage of FT-IR and Raman spectroscopy is that is often possible to image active delivery without needing to chemically modify, or ‘tag’, the active, therefore formulations can be applied as supplied.