Are you planning to sell something using nrf52840 (raytac MDBT50_module for example)?
To use some module with nrf52840
printable pictures commented
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chirag panikar commented
Solder mask, solder resist, stop mask, oil, etc. protects the copper traces of the PCB and ensures that the solder only flows on the exposed pads. It is what makes a typical PCB green in color. But it does not have to be. In Seeed Fusion standard PCB service we have an additional 5 color options for you to choose from:
https://thegadgetwire.com/kodi/ https://thegadgetwire.com/tutuapp/ https://thegadgetwire.com/appvalley/