What does the CLEAR shade do? Can I use it on color-treated hair? On natural hair?

Yes, you can use Demi Clear on natural hair and on top of permanent or demi permanent color for brilliant shine! Tip: Add Clear to prevent porous ends from going too dark. It helps to seal color treated hair and adds protection from UV rays. Be creative and mix with demi shades to customize the level, i.e. soft red or light yellow. Natural Hair: Adds conditioning, shine and brings out the brilliant tones of the natural hair color. It also adds protection from UV rays.