Hi all,

        Anyone familiar with a dye that can help indicate the presence of
residual flux?  I was just talking with another engineer who mentioned a
material called "Bromthymol Blue" that he used to use.  Is it still available
or is there's something better?
        The reason I ask is we have these small "Bumped Chip" devices on a
board.  Historically there has been a problem with residual flux under these
components, not visible to inspection and averaged out with ROSE test.  We
want to destructively remove a few and see how effective the cleaning process
is.

Thanks for your help,

Glenn

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