orange turns purple

[vincent]

I'm putting my money on some sort of mold.

The researchers hope that by investigating everything that came into contact with the now-purple fruit, they might be able to explain the chemical basis for this remarkable transition.

www.sciencealert.com/this-orange-turned-purple-nobody-knows-why-queensland-australia-fruit-colour?utm_source=ScienceAlert+-+Daily+Email+Updates&utm_campaign=a1cdcd16af-MAILCHIMP_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_fe5632fb09-a1cdcd16af-365912649

[dennisw]

Looks like potassium permanganate, but that would almost have to deliberate I can't think of any chemical reaction that would release it in citric acid.

[vincent]

They have found the answer to why these oranges turned purple.

www.sciencealert.com/so-here-s-why-orange-australia-bizarrely-turned-purple-anthocyanins-antioxidants-chemical-reactions-iron-metal?utm_source=ScienceAlert+-+Daily+Email+Updates&utm_campaign=9e213c7ffd-MAILCHIMP_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_fe5632fb09-9e213c7ffd-365912649

"The results of analysis have confirmed the discolouration was caused by the reaction of anthocyanins, a pigment that is naturally present in oranges, and traces of iron and/or other metals from a freshly sharpened knife," the report states.