OverviewBlack Castor Oil, as the name implies, is said to have the most Ash Content. It is thick and rich to enhance is effectiveness for your hair and skin conditions. Extra Dark Jamaican Black Castor Oil is processed the traditional way. The 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. Compared to other brands it is the darkest Jamaican Black Castor Oil because roast their beans longer which produces more Ash Content in their oil than other oils on the market. believes that more ash content increases the effectiveness of the oil