Steve
Most water-soluble liquid fluxes do contain a dye. The most violent was
the old Lonco 3355 stuff which was a bright magenta (I think the
colorant may have been basic fuschin). The Alpha equivalent was a light
blue and I've also seen green (Kester?). We, in a previous life, asked a
couple of manufacturers, ten years ago, whether a heat-resistant dye
could be added to w/s cored wire to make it evident when retouches
hadn't been cleaned, but they both prevaricated.
The coloured labels idea is the best, provided you have one on each
assembly, as well. This can be applied to liquid, wire and paste. The
operator then knows that he has to match the assembly label to the flux
label. Alternatively, if you have control of the bare PCB fab, you can
make the legend in light pink, blue and green to match with the labels.
Brian
"Stephen R. Gregory" wrote:
>
> Hi ya'll!
>
> We use three different flux types in our processes here. No-clean (for hand
> soldering items that can't be cleaned...unsealed switches, etc.) RMA (because
> some of our customers require it), and OA (for everything else...).
>
> We seem to occasionally have a problem with our operators picking up the
> wrong bottle of flux thinking it is no-clean, but it is OA...and yes, the
> bottles are labeled, but it still happens...
>
> Is there some sort of dye that could be put into the flux that wouldn't hurt
> the chemistry of the flux, would wash off completely, and not turn other
> things colored? I'm thinking that if there's a really different color to OA
> flux, it would lessen the chance picking-up the wrong bottle, and you can
> easily tell when OA's haven't been cleaned from the board.
>
> Just trying to make things "monkey-proof" if ya' know what I mean...hehehe.
>
> -Steve Gregory-
>
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