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The reason why most PCB soldermasks are colored green.

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BrianHG:
Well, here you go: (basically explained between 2:00 and 9:00, everything else is just extra...)


Benta:
Reminds me of Monty Python's "Election Night Special".
This guy being a bald and bearded John Cleese with glasses disseminating... something.

But OK, if you find colours important, go for it.

tooki:
I watched that video when it came out, and I think my best summary of it is “well, that’s definitely not Simon’s best work…”

I don’t think the reasons he claims actually make a lot of sense, to the point that I doubt their veracity. I forget what all he said, but between that and numerous factual errors, I think we need to keep looking for the true history of the color of PCBs.

BrianHG:
From what I have seen, the default green solder mask is the finest around the SMD pads and easiest to hand solder.  Boards I have purchased with white and black solder mask were crap by comparison as they seemed too thick, especially vertically.

Someone:
https://blog.epectec.com/circuit-board-solder-mask-what-to-use-and-what-not-to-use

--- Quote ---Green was the color of choice by LPI developers and to date is still the most popular color used in masking printed circuit boards. The green LPI has long since been the go-to color by most and because it was the initial color made, it has been tested and proven to work well in most standard production settings. The pigment allows for UV light transmission.
--- End quote ---
But some of their other dates/staements are a bit questionable.

https://www.pcbway.com/blog/Engineering_Technical/History_of_the_PCB.html
Makes a guess at it but explains how liquid solder masks have been around a very long time, so the true origin is probably lost.

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