system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are most circuit boards in a dark green shape?

I know that there are other PCB colors too, as Arduino blue or SparkFun red. But most boards in industry or in home appliances are in a very specific dark green color. Is there any particular reason for it or is it just a grown standard?
gpt
Dark green is not a shape.

Assuming, however, that you meant "colour" - it's to do with the manufacturing processes involved.  While it's increasingly possible to use alternative materials, the best-established processes use materials that are that colour.  Simple as that.