To have a "colourless" PCB would require that you either have: 1. a colourless (water clear transparent) solder mask layer on both sides of the board or; 2. you have no solder mask layer on both sides of the board. Option (1) is not available from JLCPCB. Option (2) would result in tracks and pads that are almost impossible to solder and therefore a PCB that is almost impossible to assemble.

Why would Option (2) be impossible to solder?

@kalinchuk, The purpose of Soldermask is to try to prevent solder bridging between pads and tracks so unless it is a simple PCB with widely spaced copper elements, it is very difficult to solder without creating solder bridges. It is time consuming to correct any bridges and the risk of damaging the board doing so is high. There are one or two PCB suppliers that provide maskless PCBs as a way to reduce their (already very high) prices but generally maskless boards are not recommended. For more see: [https://en.m.wikipedia.org/wiki/Solder_mask](https://en.m.wikipedia.org/wiki/Solder_mask)<br> <br>

That makes sense. In my case, the tracks are spaced out significantly so it should be okay. The board that I'm designing needs to have the look of a 1970s board so the maskless PCB is the best option, in my opinion. Thanks for the help.

@kalinchuk, You will need to contact JLCPCB - or post the question directly onto the JLCPCB forum Category - to ask if they can manufacture a board with no soldermask.