Just heated up some oil in the pan and this rainbow ring appeared is this bad?
>>370505
I guess the pan is stainless steel?
No, that comes naturally with steel (an especially with titanium) when heated to a tad higher temps. They are called tempering colors, sometimes annealing colors.
https://en.wikipedia.org/wiki/Tempering_(metallurgy)#Tempering_colors
>>370505
砒霜。立即看医生