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Jul 29 at 12:25 comment added piojo @rumtscho They turn milky/chalky when they absorb water. And I don't think the OP has given enough details for you to determine that that bottle wouldn't have contained gunky oil.
Jul 29 at 11:57 comment added rumtscho Sorry, this can't be right. Oil polymers aren't white. They also don't happen in a dishwasher - the conditions simply aren't right. I don't know for sure what that stuff is, but it's not oil suddenly polymerizing with itself during washing.
Jul 27 at 18:35 review Suggested edits
Jul 28 at 2:07
Jul 27 at 16:16 vote accept Spehro 'speff' Pefhany
Jul 27 at 15:21 history edited piojo CC BY-SA 4.0
added 314 characters in body
Jul 27 at 15:07 comment added piojo @SpehroPefhany Technically they are not the same (in particular non-drying oils), but I think once you have enough heat and oxygen, they will all start to turn sticky and polymerize a little bit. With the possible exception of those that have antioxidant components, such as olive oil.
Jul 27 at 14:12 comment added Spehro 'speff' Pefhany Thanks- are all cooking oils pretty much the same in this regard?
S Jul 27 at 11:49 review First answers
Jul 27 at 18:01
S Jul 27 at 11:49 history answered piojo CC BY-SA 4.0