Thank you for all of the information. This is the reason that I wanted to post pictures. I've gone back and forth on what this stuff is and what to do about it. This is a picture of the whole tuba. We weren't as concerned with how it looked when we bought it, but now he is going to play in a youth ...

New to owning our own instrument. Bought this tuba for my son when he left middle school and needed his own. I've been looking everywhere and going down rabbit holes, where not so many discussions take the gold into account. You can see that the gold plating is wearing off, so I'm so afraid of using ...