As [Sjaak] realized early in his PCB journey, the downside of all PCB business cards ... silkscreen and bare copper. Some people get crafty, creating new color combinations by stacking layers ...

At the end of the day, PCB etching is all about removing copper from a board in as controlled a fashion as possible. PCB etching methods generally fall into one of two broad categories ...

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This particular innovation, where a PCB is packed with stepped circular or rectangular copper coins, is headed to markets where even the best air coolers are impractical – like miniature devices ...