John K Jordan
I've soldered a lot of brass, silver solder for strength and for thin-wall brass I have even used solder made for electronics. Good flux is important. While brass rod is used for brazing steel, I agree that trying to braze brass with brass rod could be a disaster. The filler metal needs to have a lower melting point than the base metal.
There are low-temperature solders that are brass colored but I've never used them. Seems like I read that you could color silver solder with chemicals after use. I saw someone color steel by using a wire brush on hot metal - I wonder if that would work for silver solder.
One message in this thread appears to have some info you might explore.