Stained glass stores sell "patina". These are chemical washes that will
turn your solder the desired color. They also sell lead-free solder for
making stained glass pieces to be used around food.
You may need to ask if the patina is compatible with the solder.
I don't think that there is a brass colored solder, as such, but you
might want to look into a copper patina used by stainded glass
It's used to color the 50/50 lead solder user to assemble glass pieces
with the copper foil method. I don't have any idea if it would work
with not-lead solders.
The copper patina liquid is simply rubbed on and then buffed down a
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