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Originally Posted by ibmkg
I still do not have access to a decent camera. I used my cell phone and took these pics. Notice the black layer formed on the edges of the barb and 'T'.
This layer was green, I do not understand why it has changed its color.
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Typical reason is galvanic corrosion due to mix metals. If you're seeing this discoloration after a few days, it's a serious problem.
What metals are involved here?