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Home Cooking

Canola oil rainbow effect when heating?

violet42 | Jul 9, 201509:43 PM     3

Hello! I was wondering if this was normal, and couldn't find answers elsewhere on the Internet. I've been searing fish in a Calphalon nonstick skillet with a little canola oil. When I put the canola oil in the pan to heat it up, the canola oil gets a rainbow effect, like an iridescent oil slick, and then once the oil is hot the rainbow goes away.

Just wondering - is this normal? Should I not be using this oil? It's Trader Joe's canola oil.

Thanks!

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