Unsalted butter turned orange!

I found unsalted butter in my fridge that was ORANGE. I wonder why it was like that. I thought it was originally yellow.

I asked people and found out unsalted butter oxidizes under the right condition. Which means little bacteria happily feed on the fats and protein under the right conditions. Oxidized butter could be toxic from bacterial metabolic toxins, or products of butter breakdown.

If it has a rancid smell or taste contrary to regular fresh butter... then don't eat it of course...

Heating butter will result in air peroxydation. Also occurs naturally at reduced speed. Results in oxydations of the alkylic chain...you thus get hydroperoxydes, alcools, cetons, aldehydes.

This gives the bad taste (usually fresh butter taste like nuts) on a moderate concentration it taste acidic but once it is heavily "polluted" by oxydation it being microbial or aerobic... it can fast turn disgusting and unhealthy-carcinogenic. The worst cancers are stomach and intestinal...want to try?

I got that from the user PHILOU Zrealone from h

http://www.sciencemadness.org

Apparently it's a website full of science geeks. I mean geek as in a compliment.