Rancid
If canola oil smells fishy or musty, it is likely rancid. To tell if canola oil is bad, look for a sour smell that resembles old paint, nail polish remover👀, or other chemicals. The oil could also have turned rancid which would definitely make it taste "off". Some canola oil has DHA added, which is fish oil. If your canola oil has DHA added, it could be the reason for the fishy smell.
@Zevon same cold pressed olive oil and avocado oil and coconut oil to fry things in very high heat.
Transition to Cooking:
After the war, Canadian scientists worked on breeding a rapeseed variety with low erucic acid and better taste. This led to the creation of canola, which was approved for human consumption in the 1970s. It became popular for cooking due to its neutral flavor, affordability, and health profile.
Rapeseed Oil and Its History:
Before the development of canola, rapeseed oil was used primarily as an industrial lubricant, including for machinery during World War II. However, it was not widely used for cooking at the time due to its high levels of erucic acid, which was considered harmful in large quantities.
Canola's Name Origin:
"Canola" comes from "Canada" and "oil", combined with "low acid." The name was coined in the 1970s to describe a new variety of rapeseed developed by Canadian scientists. It was bred to be low in erucic acid and glucosinolates, making it safer and more suitable for human consumption.
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