L'Oreal Paris- ELSEVE Glyco Gloss Acidifier 150mlL'Oral Paris Elvive Glycolic Gloss Shine Glazing Acidifier. This product is designed to restore hair quality and provide extreme gloss that can last up to 6 washes. Its lightweight formula penetrates the hair cuticle to smooth the surface, seal in shine, and lock in hydration without weighing the hair down. It is part of a 4step routine that includes a shampoo, conditioner, acidifier, and serum, all aimed at achieving a salonlike shine at home.