Can I also use the products of Plantur 39 Colour Blonde, if my hair has only blonde highlights and not completely dyed?

The Plantur 39 Colour Blonde products gradually give the hair a warm, radiant colour and conceal grey hair. The longer the Colour Blonde Shampoo is left in, the more effective the result. The use of the Colour Blonde Conditioner after washing the hair gives a greater colour brilliance. However, the products do not have a lightening effect. This colour effect occurs only on the blonde highlights. Regular application to the rest of the dark hair only results in a slight colour brilliance.