Product Description CREATE THE NATURAL COLOR THEY LOOK FOR IN JUST FIVE MINUTES. LESS GRAY IN LESS TIME. You should perform a quick allergy test according to the warnings on the coloring product. Then mix the color with theDeveloperin a 1: 1 ratio in a container. In general, for hair of about four centimetres, about 40 ml is needed. For a natural look, let the gray show a little in key areas like the sideburns or temples. IMPORTANT: Avoid application time exceeding four minutes. The exposure time of the product is 5 minutes from the end of the application. Size:3 x 40 ml