5941
Chemistry / Re: Milk solidified into a large, rubbery, lump when poured into coffee and stirred
« on: 31/01/2015 05:35:05 »One of my co-workers was making coffee - when she poured the milk in, stirred, and felt something solid in the cup. When she fished it out, a large lump of brown, rubbery solid was on the teaspoon. It was malleable, easily breakable, and must have formed in a couple of seconds.
A few weeks ago I was making hot chocolate, and added a touch of lemonade mix, and ended up with lumpy milk.
I'm wondering if your coffee was more acidic than usual. Old burnt coffee?
Takes me back to a book of home chemistry experiments I had a a kid. Clifford is right, the coffee or the milk must have been acidic and what you have got is casein plastic, the casein in the milk has formed a long chain. I suspect that although the milk was ok it might have been close to turning hence more lactic acid.
If I remember correctly they used formalin to harden it, was used for knife handles, buttons.