An extract direct from the Horse Show Colour website with there permission
"Ocolor is our new Hybrid horse/pony colour that is designed to fit between our HSC no ammonia permanent colour and our HSC colour shampoo. It is a thick cream colour that is applied firmly (rubbed in) on a dry or moist coat and left for approximately for 15 - 20 minutes. The longer you leave the colour on the coat, the darker it will become. Once you have reached your desired level, simply rinse off with HSC shampoo and conditioner. The coat colour should become richer in depth like a permanent colour. The whole process should take around 1 hour, if you follow our S technique on page 17 of our manual. Ocolor should last around 3-6 washes or 1-3 weeks. Ocolor is able to do a 17 hand horse with a 1/4 of a tub left over."