Glenn: Add a UV tracer to your flux.If flux residues are present after
cleaning they will fluoresce when exposed to a UV(blacklight)source.
I have used Rhodamine B in the past with water soluble fluxes.

Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-356-6076

-----Original Message-----
From: Glenn Pelkey [mailto:[log in to unmask]]
Sent: Tuesday, February 22, 2000 10:31 AM
To: [log in to unmask]
Subject: [TN] Residual Flux Indicator


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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