After some time the printed circuit boards of the assembly of my designs becomes dark showing signs of oxidation. Is there any kind of protection?
Yes, we can use two types of protection. One is to pass a weak solution (5%) of silver iodide (can prepare in manipulation pharmacies). This solution, also called pratex, plugs the copper tracks that do not rust so easily. Another is to pass a layer of ordinary varnish, which avoids the action of atmospheric oxygen, which causes the oxidation of the copper tracks.
