i want to try some aluminium pcbs and i need to understand what i have to do in order to have a coloured pcb + some exposed copper. 1) if i select a color for the pcb, is that color going to be normally poured all over the pcb on the top and the bottom of it? 2) example: the pcb is filled by a copper ground, then i have any solder mask layer “stuff”(solid region, text or image)—> will the result be a colored pcb with exposed “stuff” with a aluminium core in the middle? 3) in addition of what i mentioned above, if i don't fill the pcb with a ground plane, if i expose through TopSolderMask, will i see the Aluminium? thanks for the help