Hi i’ve made some of my own mokume and the first thing that i would
like to point out is that the copper will be the softest metal in
the mix, therefore it will become the thinnest layer with a very
subtle presence in the pattern.It is suggested to use metals with
similar characteristics (but rules are made to be broken).
As for the bronze i personally prefer the alloys without zinc, but
if you are using brass in the mokume the avoidance is pointless. as
for the difference manganese bronze has a colour similar to 14k gold
and is a copper and tin alloy.
The final thing to consider is if you are going to solder or fuse
the layers together? Rob