yes red over white will produce pink[fuscia]The law of color is the same no-matter which medieum you apply it to.hair is a medieum.i am an ex hairstylist.and i got pink a few times befor that sunk in.if you paint a white wall red it will be pink with just one coat.but with many coats it will be red and also fuscia has a little blue pigment mixed in.most haircolors are a combination of all 3 primary colors.a nice hair color contains 3 parts yellow,2 parts red and 1 part blue.this gives an attractive brown color.the ratio is the same for blond or black and in between.demi-permanet is just a different volume developer.the actual chemical is the same.demi means -sort of permanet....love to talk color.