Good morning all,
I have come across something I have never seen before and thought it would be a good idea
to see what my panel of experts have to say. I have some assemblies that are showing a
purple stain in the laminate around the gold contacts of a board edge connector. Under
the microscope, I see no sign of anything on the laminate on the boards from stock. I
took a sample of the stock boards and ran them, unpopulated, through the reflow oven and -
lo and behold - I've got a stain. The stain seems to be in the epoxy. A little light
scratching with a knife blade takes off something purple.
Any ideas as to what I am looking at?
Gary Camac