Printed circuit boards were once so simple. One or two layers of copper etched on a rectangular fiberglass substrate, with a few holes drilled in key locations so components could be soldered into place. They were functional objects, nothing more—built only for the sake of the circuit itself.
Fast forward to today, and so much has changed. Boards sprout so many layers, often more than 10, and all kinds of fancy geometric features for purposes both practical and pretty. But what catches they eye more than that, other than rich, saturated color? [Joseph Long] came to the 2024 Hackaday Supercon to educate us on the new world of full color PCBs.
[Joseph] begins his talk with an explanation of terminology. We often look at a PCB and cite its color—say, green for example. As [Joseph] explains, the color comes from the solder mask layer—so called for its job in ensuring solder can only go where it’s supposed to go. The solder mask sits atop the copper layer, but beneath the silk screen which has all the component outlines and part labels.
Solder mask was traditionally green, and this is still the most common color you’ll find in the majority of electronics. However, in recent decades, the available gamut of colors has increased. Now, you can routinely order yellow, blue, purple, and red solder masks quite easily, as well as black or white if you’re so inclined. As some creative makers have found, when designing a board, it’s possible to get several colors into a design ..
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