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For a seemingly endless time, soldermask has been green and only green. But all that has started to change.
If you're wondering why anyone would even bother using a soldermask of a different color, here's one example of a reason for using a variety of colors. It was 1997 in the lobby of the headquarters of Apple Computer. Jack Evans of Marcel Electronics and one of Apple's commodity managers were comparing soldermask samples with the colored banners hanging from the rafters. The challenge was to produce printed circuit boards that would match the colors of the new Apple iMac whose new look put a dent in the design world from that day forward.
Since then ...