This document discusses different types of hair coloring including temporary, semi-permanent, quasi, and permanent colors. Temporary colors wash out in one shampoo and contain large color molecules that sit on the cuticle. Semi-permanent colors last 4-8 shampoos and have slightly smaller molecules that sit on the cuticle. Quasi colors are between semi and permanent, lasting 18-24 shampoos with a mixture of large and small molecules penetrating the cuticle. Permanent colors contain small molecules that penetrate and become trapped in the cortex, covering 100% grey and lasting until fading, though they require a skin test beforehand due to chemicals like hydrogen peroxide. Proper safety procedures must always be followed when using hair