This is all on Wella Kolestint Colour. You'll have to take one for the team even if this is like what my Grandma repeats, "It's always darkest before the dawn." Days are gone when people used to prepare hair color by the leaves of the herbs. • Suds Up Safely The cardinal rule post coloring says- Don't wash your hair two days post coloring. Some quality products have arrived into the market to for this sake. People usually try every formula and remedy to maintain the serene to the hairs.