Bismuth bronze has the same armor and weapon modifiers as regular bronze (75% as effective as iron). Bismuth bronze can be used to make all furniture and other objects. Bismuth bronze is 20% more valuable than bronze and is colored differently. Bismuth bronze is three times more valuable (6) than its component parts.
Bismuth bronze is made with the following recipe:
Because of these proportions, bismuth bronze is produced in lots of 4 bars at a time. While the ores must be smelted normally, only 1 additional fuel is needed to produce those 4 bars of bismuth bronze from the 4 bars noted above. (Or in a magma smelter, none at all.)
you can make a lighter colored bronze by adding bismuth, used temp values from bronze, used by incas, at least according to one source ha ha
[NAME:bismuth bronze][ADJ:bismuth bronze][COLOR:6:6:1]