Wire striping experiment-not worth it

[CMHN]

After you pull it out of the vinegar, you need to rinse it with clean water. If you don't it will turn green. But if you rinse it will stay clean.



Here is an explanation from another website.

When the vinegar and salt dissolve the copper-oxide layer, they make it easier for the copper atoms to join oxygen from the air and chlorine from the salt to make a blue-green compound called malachite.