The color lasts up to 6 weeks. During this period, new eyelashes and eyebrows grow and must be dyed again. The best results are achieved when the dye is applied regularly, because with each dye application the color will penetrate deep into the eyelashes, leaving them more intensely and long-lasting. All Rfectocil professional dyes need to be mixed with 10-volume oxidizing cream to work properly on the hair. This oxidizing cream is not included with the dye and must be purchased separately. HOW TO USE Mix 10 drops of oxidant with 2 cm of product to achieve a creamy consistency. Leave for 5 to 10 minutes, depending on the intensity of the color you want to achieve.