The Dramatic Evolution of Hair Extensions in Stage Performances: From Practicality to Artistry Keratin, a natural structural protein in hair, can be harnessed to reinforce the hair's integrity. In the context of hydration, keratin treatments often involve the application of a specially formulated solution containing keratin molecules. https://www.bondihairsalon.com.au/blog/the-dramatic-evolution-of-hair-extensions-in-stage-performances-from-practicality-to-artistry