Carmine is not made from petroleum so, no, it's not a stretch. It's the insect component.
It took us a couple years and it was done by listing everything she ate before she broke out and the looking at the ingredient lists of the products.
Mostly it was extremely dark chocolate products that was causing the problem and when I investigated how they made things like Black Forest Cake, etc, that's when the common ingredient became apparent.
Carmine is also used in some yogurts.
I’m not talking about Carmine, I am talking about Red #3 which my original post was about.