Maximum Effect is a semi permanent water based hair colour . It comes in three different colours. Chestnut to enhance your horses chestnut coat. Brown to deepen the colour and Black to darken any coat even more. This should last approx 15 washes. Please NOTE Maximum Effect needs hair to adhere to so do not use on a freshly clipped horse. Also do not wash the horse before hand as if you wash the horse with a shampoo the oils in the shampoo will form a barrier between the hair colour and the hair follicle Please do test inside the hind leg before use.