In a hundred years acid rain will create a patina on the copper dome of a state capitol. That is not a paint or a stain. It is a change in the copper. It happens by itself and lasts forever. It is the same thing with the patina on these copper peace poles, but I cause it to happen in a few days instead of one hundred years. Or, at least, I cause the blues to come out in a few days because the blues are the last to develop. The rest are best left to develop under your specific weather conditions.