This Developer is specially designed to blend with both PE Cosmetics' Liquid Keratin Hybrid - and Cream Hybrid Brow & Lash Shades. The Oxydant Creme Developer with 4% hydrogen peroxide is specially made to mix with the PE Cosmetics Hybrid Shades for Hybrid Tinting and Brow Styling Treatments. It contains Panthenol and Dimethicone. Use i