This exceptional product is formulated with natural ingredients for long lasting results for basic tint colors.six basic tint colors offer a wide variety of shade options when mixed,creating a customized look for your clients. This exceptional product is formulated for long lasting results. One of the most popular lash & brow hair tinting products on the market today. For professional use only. 20 ml. Note: For maximum shelf life, store in an air-conditioned area. Excessive heat or freezing will shorten the shelf life of the product. Due to oxidation once the product is opened, the manufacturer recommends replacing tint and developer within 3 months. Intensive Lash and Brow Tint is not tested on animals.