Gamer's Cartridge PCBs in various colors
I unfortunately didn't had blue Rev 3.3 (b) PCB when taking the picture above ... in fact, it's a long time I didn't soldered blue PCBs
The main interest in soldering PCBs with different colors is to make soldering activity funny, which is important for me since cartridges are assembled by hand : if making cartridges would become boring, I would prefer to stop everything rather than automatize assembly process !
My impressions after soldering a black PCB are ... a bit mixed : yeah, the PCB looks cool, but there's no contrast between tracks and isolated areas, so I definitely wouldn't use this color for new projects
One example of this lack of contrast can be found in cow logo, whose rendering is terrible in black color :
Cow logo on black PCB ... playing hide and seek
Among PCB colors I tried so far, I personally prefer ... standard green color, and then maybe red color. Also, I still didn't tested yellow color, so let's try it on next batch I fear that contrast won't be better than on green PCB however