Rapeseed Oil otherwise known as Canola Oil but it needs to be treated before used for human consumption. It was a marketing idea to rename it Canola Oil. Main component removed for domestic consumption is erucic acid & the oil is deodorised as well to make the smell less offensive or inoffensive 
Most varieties grown for human consumption have very low amounts of the acid in them compared to the industrial varieties (2% vs 60 - 80%).
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