Sunny Isle - Extra Dark Jamaican Black Castor Oil 8oz Extra Dark Oil, as the name implies, has the most Ash Content. It is thick and rich and is the most effective Oil for all your Hair and Skin conditions. Sunny Isle Jamaican Black Castor Oil is processed the traditional way. Organic seeds are roasted and ground by a manual Grinder and then the crushed beans are boiled to extract the 100% pure, dark brown, organic oil. The Sunny Isle brand will strengthen and increase the length of your hair faster than any other brands on the market today.