A slow response to this question.. The silver brazing alloys that
contain copper start to lose the silver tint as the copper content
increases. There are many alloys that have a brass tint that do not
contain cadmium. I have used mostly easyflow 35 - but the cadmium
containing one for about 40 years on and off. I don't try to breath
in the vapours along with flourides from the active fluxes. Never
smoked though- still kicking.
If you look through the modern listings you will find many cadmium
free alloys and some cadmium containing. Some of the suppliers have
discontinued making selling cadmium containing versions totally.. It
won't be hard to find brass colored ones. The degree of color
matching acceptibility is up to you see:
http://www.lucas-milhaupt.com/ part of Handy and Harmon
Joining with parent metal as the filler material is really welding --
you probably don't want to do this since you don't wish to melt the
parts just the filler.
You should be able to get close to what you want. Download the
A harder job is matching copper color. with a brazing alloy. In this
content only gilding metal ( 95% copper 5%zinc) comes close. in a
reasonably available material..
You will find a few alloys that contain that contain a small
percentage of nickel- these are not jewelry fabrication materials but
are intended for brazing stainless steel where they wet the surface a
bit better. Allergy conditions are an individual issue.