Just as for the shells, the husks also do not contain any oil. The husks are the hard and brittle coating of the kernels. The husks can become a blocking wall to obstruct the extraction of oil from inside the kernels. This will affect the performance of the oil recovery. The removal of the husks is not a common practice because as yet no mature technologies are available to recover the kernels on a large scale basis. The easiest way to improve the oil yield is to rupture the whole seeds into broken form as the feedstock for the oil extraction process. This allows a greater exposure of kernels to the press tool in order to increase the extraction efficiency. The quality of the Jatropha crude oil is also an important issue since it can affect the quality of the biodiesel production for use in vehicles [67,68]. The husk content tends to affect the colour of crude oil and contribute to the formation of sediment in the crude oil. Achieving low husk content will definitely reduce impurities in the extracted crude oil. The efficiency of any subsequent crude oil purification process in biodiesel production can also be improved simultaneously