Greetings!

I'm having conversations with a board vendor.  We received some boards
that are showing signs of Pink Rink (Actually it's Green Ring on these
boards...).  I know IPC-A-600 & 610 & J-STD-001 all say that Pink Ring
is acceptable.  However - past shipments of boards from this vendor do
not have Pink Ring and if he didn't sharpen his drill bits on-time, why
should I accept this anomaly.
Additionally some of the areas that exhibit pink ring are bordering on
what looks like an internal delaminations.

My thoughts are:
Order of Precedence is what is agreed by the customer & vendor and the
IPC documents are below what the customer wants.
If the vendor's quality or process has changed to exhibit Pink Ring (or
any other anomaly), I don't feel I have to accept what I would consider
a lower quality item than was previously supplied.

Questions:  Any new info on Pink Ring or other cosmetic anomalies? What
would you do???

Thanks

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