Here's a Swiftech GTX CPU water block that has a non-copper/soft metal in the top that has been reacting with chemicals in the fluid from mixing dyes.
The gunk:

The dye alone (covering the pins) would have annoyed me without the gunk:

With some of the gunk scratched away:
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With the gunk gone you can see how it was using the metal in the water block as some sort of catalyst eating it as it went:
Coolant used: PrimoChill Ice Clear
Dye used: PrimoChill DyeBomb UV Blue (Approx. 1ml due to container breaking)
Re-Fresh Dye used: Feser View UV Blue (Approx. 10ml)
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