Why are printed circuits usually green?

printed circuits

The vast majority of plates with printed circuits that we see in the market usually have that characteristic green color of all known: we have seen it in the Raspberry Pi for example, but also in many other solutions.

Why this green color and not another? In fact it is possible to find plates with printed circuits in many other colors, but that green has become a de facto standard without anyone seems to be clear about the reason. There are some theories about it, however …

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