boards are already on their way from jlcpcb but it will take a while for them to arrive.Any colour, asl long as it is permanent. But some have trouble staying on the pcb or doing fine lines with enough coverage. A lot of trial and error, or repairing of tracks.
Unless the board is bigger than 100x100 I would go with chinese fab like jlcpcb. I even redid a layout of one board just to split it into two parts by function and ordered two sets that would fit in 100x100 - filled the rest of space with square vias to serve as a protoboard.