Broad bean water went brown overnight
We had broad beans last night (in a risotto - yum!)
I emptied the beans from their pod, blanched them, then removed the skins from the individual beans before putting them into the risotto.
I never got round to cleaning up the pan in which I had blanched the beans, and when I came into the kitchen this morning I discovered that the water in it was a brown-ish/orange-ish/bronze-ish colour (still entirely transparent, though). There was no colouring at all after I'd blanched the beans, and I didn't do anything to the pan in between - just left it on the hob.
Does anyone know what the colour is, and by what mechanism it appeared overnight?
Best Answer
Speculating - (colloidal) rust - from iron in the beans - via oxidation.
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Why are my broad beans turning brown?
Broad bean rust is caused by the fungus Uromyces viciae-fabae. It is not as damaging as another common broad bean disease, chocolate spot, but severe attacks can cause defoliation. Expect to see significant levels of this rust from mid-summer.Why does broad bean water turn red?
So I checked, and it turns out that the skins of most legume seeds, favas included, are rich in the same proanthocyanidins. New theory! Colorless proanthocyanidins in bean seedcoats release fragments into the cooking water, and these are what turn the water pink.How long will broad beans keep in the fridge?
How to store broad beans. Keep in a perforated bag in the fridge for up to five days. Blanched beans can be frozen and stored for up to three months if you have a glut.Why do fava beans turn black?
You may see black spots on some fava bean pods which, according to the University of California Specialty and Minor Crops Handbook, is caused by fungus brought about by wet growing seasons. Don't sweat it -- the beans inside are perfectly healthy.How to save broad bean seeds
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Answer 2
no, definitely not rust from the iron content in the beans, the amount of iron in Broad Beans is far too small for that. It is more likely the tannins from the beans.
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