Formula 2. Hair dye

Oxazololindole carboxylic acid derivative, 0.07% w/w
Benzyl alcohol, 5.00
Ethanol, 25.20
Monoethanolamine, 2.00
Ammonium thioglycolate, 3.34
Hydroxyethyl cellulose, 1.50
Water (aqua), qs to 100.00

Procedure: Dye is applied on the hair for 30 min, followed by the application of
a composition containing zinc acetate dehydrate at 3.35% and water qs to 100%, then rinsed and dried.