yet another reason not to trust a block with mixed metals...all you swiftech suckers note this. anodizing is all well and good till you start using metal barbs and running water through it.
the white is certainly aluminum oxide, and given that the base looks to be a purely mechanical join (no sealants adehesives solder etc) its likely the water found a way through.
i worked on antenna systems in the USAF and in my expirience if you leave anything long enough water will find a way through. we found water in slice cases that were preassure sealed, and coated with a conformal coating 2" thick...
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