Garnier Ultra Hair Color 7.3 Golden Brown - 55 mlGarnier Ultra Hair Color 7. 3 Golden Brown 55 ml How to Use Perform a skin allergy test hours prior to the coloring. Please purchase the product a day before you color, as you must conduct an allergy test 24 hours before each time you color, even if you have colored your hair before. Wear gloves provided in the box and mix developer and the colorant in a non metallic bowl in a 1: 1 ratio. Start at the roots and work your way towards the tips, while