Stacey, when I solder brass, I actually braze it, using hammered bits
of a 1/16-inch brazing rod. It’s the only yellow-colored brass
solder I’ve been able to find. You can only use this on red brass
(Nugold, Merlin’s gold, etc.), not the standard brass which melts at
a point just below the melting point of the brazing rod bits. The
color match is not quite perfect, but it’s much better than the
silver solders. As for copper, as someone else on Orchid mentioned
awhile ago, hammer out a pre-1981 penny and cut it up for soldering
copper. Good luck!
Judy Bjorkman
@JLBjorkman