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Joining Brass
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The joining of brass is quite straightforward (use any silver solder/flux combination) - until the question of colour match enters the equation.
Now the situation becomes more complex.
All silver solders are basically brass with silver and/or cadmium added. This addition is made to lower the melting point of the silver solder to enable you to make joints without melting the parent material.
The downside is that both of these metals are white and change the colour of the alloy. They become lighter in colour.
For a better colour match consider an alloy with less white metal eg 424 containing 24% silver. This has a melting range of 740 - 780°C, but which may be too high.
Perhaps consider 430 containing 30% silver - melting range 665 - 755°C
If the brass is to be polished probably the best one to use is 445 containing 45% silver with a melting range 640 - 680°C.
Keep the joints small, feed the alloy internally (say with a ring or simple preform), heat externally and draw the silver solder through. This will produce the smallest fillets.
The extra silver content offers greater reflectivity making the joint line less visible.
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