Removing rust with vinegar: weird reaction

yoothgeye

I build stuff.
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Jul 1, 2010
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Roanoke Rapids, NC
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I’ve used vinegar to remove rust from old chains plenty of times. You can see the rust bubbling away and it leaves a light film of bubbles and rust on the top.

Well, I normally use apple cider vinegar but the other day I used white vinegar, put the chain a peanut butter jar and slid it out of the way for later. I went in the shop today and saw this:



It frothed up and even some fell over before I found it (on the floor behind the jar). When I touched it it was so light it would just float away.

The chain was rusty and dry, untouched for 30 years. Just sharing because it was super odd.


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