Nature's Tattva jamaican black castor oil has been imported from black castor procured from the jamaican area, traditionally made to perfection. Let us explain the basic difference between castor oil and jamaican black castor oil. Castor oil is cold pressed from the seeds while the castor seeds are roasted, ground and boiled first before being cold pressed for jamaican black castor oil. Due to roasting, the ash content in the oil increasing, hence giving it a blackish colour due to this high ash content, the ph of the oil is also high, which makes this variety of castor oil is more effective.