Re: Another scope 7854

 

That sounds like the same thing but the color I observed was
definitely purple. It looked very much like the result of mixing
purple and yellow crayons.

I considered indium solder but removing the gold by dissolving it in
tin worked well enough and was less expensive.

On Fri, 5 May 2017 22:22:14 +1200 (NZST), you wrote:

The older heavily gold plated HP boards used to develop distinctive dark gold tin intermetallics between the solder and the board after a few years. The forrmation of such intermetallics is why a solder pot is used to remove gold from the solder pockets on connectors for high reliability wiring harnesses. Indium solder is another approach but its more susceptible to corrosion

Bruce

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