Making Soap with Waste Vegetable Oil
Assalamu alaikum warahmatullahi wa barakatu i would like to ask if it is permissible to make biodiesel or soap with waste vegetable oil (which is the cooking oil thrown away after it was used in the kitchen to make food).After being used,this oil still has food particles in it.this oil could have been used to fry pork products.But prior to using this waste cooking oil to make biodisel or soap,the oil will be filtered using a filter not allowing particles greater than one micrometer to be in the final product(biodiesel or soap). As you can see,the food particles left in the filtered oil will be very very small indeed,and cannot be seen with the naked eyes, but can only be seen with powerfull scientific instruments.I would like to emphasis that we do not know if the non-filterd wate cooking oil, was at all used to fry items containing pork products.This filetred oil will be used to make biodiesel, which goes into car tank, so perhapsthere is no obejection here. But it could also be used to make soap. When people wash their hands the soap could splash on their clothes, so this is my concern if the tinyharam particles stay in people's clothes while they are praying.These particles will not be transformed during the chemical reactions for making soap or biodiesel.So please tell me if it allowed to use waste cooking oil to make biodiesel or soap knowing these facts. Jazakum Allah khairan!
