Wash the skin area chosen for the test, and apply a small amount of product on your forearm or behind the ear. Let it act for around 30 minutes. Then wash with plenty of water and await for 24 hours, if during this period any symptoms of nausea or any irritation, itching or redness arise in the area (or near it) your hypersensitivity to the product will be proven. Therefore, do not use it. STRAND TEST: Part a thin wick of hair from the upper part of the head, mix a small amount of product and apply to the wick, leaving it the time indicated in the brochure. Then wash the wick. If head would become brittle of you will start feeling itching or some warmth, this will be a sign your hair is not be able to use the product. DIRECTIONS FOR USE: Mix the product with 20, 30 or 40 volume Hydrogen peroxide Amend Color Intensy (according to the required texture and bleaching desired degree), with a 1:2 ratio (as an example: for 1 measure of Amend bleaching powder, use 2 measures of hydrogen peroxide). Mix with a non-metal spatula or a brush until obtaining a homogeneous mixture. Apply to dry, unwashed hair, starting from the back of neck or darkest parts. To touch-up roots, apply cream only on areas where hair grows, without touching where color is faded. After the application time, wash hair to fully remove the product. We therefore recommend apply Amend Expertise Color Reflect shampoo and conditioner. APPLICATION TIME: It must be controlled by the professional, taking into consideration the bleaching desired degree. PRECAUTIONS: CAUTION: Contains substances which may cause skin irritation to certain individuals. Before using the product, it is essential to carry out a sensitivity test and a strand test. Keep out of reach of children. Do not use on eyelashes and eyebrows. In case of contact with eyes, rinse thoroughly with plenty of water and seek medical advice if necessary. Do not apply if the scalp is irritated or injured. This product may cause an allergic reaction. In case of pregnant and nursing women, ask medical advice before using. The product is not adequate to be used by children. Misuse of this product may cause damages to the human body. Use proper protective gloves to apply the product. This product must only be used for the intended purpose, being DANGEROUS for any other use. *It can be used in any hair types, provided they are in healthy conditions Contains ammonia. FOR EXTERNAL USE ONLY.