On Thu, 8 Nov 2001, phil at rephil.org wrote: > There may be a little significance, but the color is just a by-product > if that is the case. > > Many cheap (consumer electronics) PCB's are green, because they use a > cheaper board, and only one sided thru-holes. Often times, blue > boards were a sign of a better board (I forget the material) with a > better (epoxy?) finish and dual sided / plated thru holes. [1] Also, > I recall seeing blue typically on multilayer PCBs, i.e., 3 or 4 > circuit layers sandwiched together, and in a really heavy RF > application (like a GHz processor) might even have an internal ground > plane. I don't recall seeing green for "real" PCBs. Okay. I asked a question, you gave a valid answer. Works for me. :) Jima