Erasable hair dyeing process

A process for erasably coloring a hair fiber on a living human head, said hair fiber having a first color, said process comprising

• (1) contacting said hair fiber with a composition containing a dye selected from the group consisting of
• (i) dyes having the formula I ##STR21## wherein, Z is ##STR22## ;
• R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, W.sup.1, W.sup.2, W.sup.3, W.sup.4 and W.sup.5 are, independently, hydrogen, halogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• Y is hydrogen or ##STR23## wherein R.sup.7 and R.sup.8 are, independently, hydrogen, halogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• and X is a cosmetically acceptable counter anion;
• (ii) dyes having the formula II ##STR24## wherein R.sup.9 and R.sup.10 are, independently, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• R.sup.11 is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• and X is as previously defined;
• and
• (iii) dyes having the formula III ##STR25## wherein R.sup.12 is C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• R.sup.13 and W.sup.6 are, independently, hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
• R.sup.14 is cyano or halogen;
• n is 1 or 2;
• and X is as previously defined;
• and
• (iv) mixtures thereof;
• and a cosmetically acceptable vehicle therefor;
• said dye being present in said composition in an amount sufficient to impart to said hair during said contacting, a second color;
• and
• (2) contacting said hair fiber having said second color imparted to it with alkaline hydrogen peroxide in an amount and for a time sufficient to restore to such fiber a visual appearance of said first color.