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Adamo, these are just different colors that represent various layers of a PCB. Since during PCB routing, it is important to know which tracks are on which layers, people use visibly distinguishable colors for different layers. Two traces of different colors can cross each other since they’re on different layers but two traces of the same color cannot cross. This helps in verification step of a PCB before it is sent for manufacturing.

printed circuits assembly

The question is pretty good and most of the posts are informative as well. I am going to ask a question about silicon and germanium products. I was told by an Electrical Engineer that one of the reason for earlier German and Japanese made products to last longer than today's Chinese-made electronics was: Germans and Japanese used Germanium as the semi-conductor and now China-made electronics uses silicon as the semi-conductor. How true is this statement? It got me a little interested as both elements lie in the same column and both are semi-conductors. I have seen parts made up of silicon rather than Germanium-made parts and I had always thought that use of silicon was due to its availability and I also presumed that silicon and germanium had similar quality. I would greatly appreciate if anybody can shed some light over this curiosity.

pcb assembly