Is this corrosion normal?

Found 5th Sep 2017
My partner and I noticed that the back metal cover on our fridge had a screw missing and appeared bent back since we'd owed it since new, we took closer look and found all this green stuff.

i appreciate this might not be the best place to post but any help will be great fully received.

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Nothing to worry about - this link gives a good description of what has happened.…tml
"Copper is a metal that tarnishes and turns green. Iron rusts because rust is iron oxide. ... Unlike iron that grows weaker as it rusts, since the coppercarbonate is only a tarnish, it doesn't take away from the strength of thecopper. Therefore, a green copper pipeis no weaker than a cleaned copper pipe" yep its normal
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