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Preparation instructions : In a large bowl, gradually add warm water to the powders until you have a relatively thick paste. Do not use metal utensils. Before applying to your hair, cover the mixture with plastic film and let sit for one to two hours so the colour can develop. Approximate quantities to be used : For short hair : 50 to 100g of powder For medium-length (shoulder-length) hair : 150 to 200g of powder For long hair (mid-back) : 200 to 250g of powder For very long hair (hip-length) : 300 to 500g of powder How to apply : Apply a thick layer of the mixture preferably to unwashed hair, strand by strand. When hair is thoroughly coated, wrap it all in plastic film and let set. The leave-on time will vary considerably depending on your hair's porosity and colour and the desired result (from one to 12 hours). Rinse hair thoroughly until all residues have been removed. The final colour result will appear two to three days after application, which is the time required for the colour to oxidise.