Dermal Dye is a must-have product for persons affected by skin tone irregularities caused by such conditions as Vitiligo. What makes this product particularly effective is that the formula permits color customization, by allowing the user to match skin tones through the addition of simple food coloring. The product comes in a clear formula, and I just add the necessary combination of colors to achieve the desired hue. Additionally, one of the active ingredients is thought to actually promote re-pigmentation during the coverup process. A tip for mixing the product with food coloring is to mix in small quantities, say not more than one ounce of Dermal Dye at a time. I use a second small container, and then add the colors as necessary. I have found that I can use a one-ounce mix on both hands for about 4-5 weeks.