Yes it is “ paint "( I don’t know what you mean by paint or varnish, varnish is transparent and paint is not both are coatings ) or maybe better defined as black lacquer over brass.can you tell me if the selmer action 2 from the 1991 series is painted black or if it's varnish? and what changes in the black sound?
I had a silver plated Mark VI soprano and just let it tarnish because it was a pain to take care of. It only turned black around the ribs and keys and the body turned an odd color.Amen - just let your silverplated horn tarnish.
I don't think so. Nitrocellulose is very flammable.Well, "paint" and "varnish" are not terms of art.
It's my understanding that Selmer still use a nitrocellulose "lacquer" (in inverted commas because it's not REALLY lacquer made from the secretions of the lac insect, it's a synthetic simulation of that). What it is, is a resin (nitrocellulose in this case, but other companies use other formulations) in a solvent carrier. As the solvent evaporates, the resin cures (it's not a drying process, it's an irreversible chemical reaction) and becomes hard.
If you want to color the coating, you add pigmenting materials. Most saxophones have a transparent tint added. For opaque coatings (as black "lacquer"), the pigments are opaque and basically consist of ultrafine particles suspended in the resin/solvent, and they're fixed in place when the resin cures.
Many other manufacturers use a two part coating for the resin - this could be epoxy, could be urethane, could be other things. The old Conn finishes from the 50s through the end were, I believe, epoxy, and they're extremely durable.
So if you have a black Selmer, it means that the coating has a black pigment in it. You can call it "paint", you can call it "varnish", you can call it "coating" but those terms don't have any actual technical meaning.
Yes, lacquer typicallly darkens and scorches when doing solder repairs, and you have to be careful when repadding.I don't think so. Nitrocellulose is very flammable.
It would be impossible to make a soldering (or even, a repadding with a torch) without loosing a lot of lacquer.
Moreover, using nitrocellulose would be very dangerous for the workers.