This is what I was able to find. I barely have enough time to read every thread nowadays, never mind do homework
Pc -- work --pc -- work.....
Is there anything else out there?
Ford, I hope this Google explanation isn't too far off from reality.
Sahari is an alloy of copper (87%) and tin (9%), with small amounts of zinc, lead, and silver. It is famous for the rich tones that can be produced when an object of this alloy is struck. As far back as the Nara period in Japan (710-784 AD), this metal was widely used to make gongs, ( dora in Japanese) and temple bells. Another popular use of this alloy was to make spoons and bowls. There is evidence that the metal was cast into a given shape then refined with forging and ornamental embellishment. The metal has a gray color that is typically left without patina.
Before attempting to create a patina on cast bronze, the metal is subjected to a surface refining process called yaki-namashi . During this process, the metal is heated to remove lead and then cooled gradually. This compensates for the unequal distribution of alloy constituents in the casting, creating a uniform surface that will respond predictably to patination.
I think the reason so few of us know much about it, is that it isn't very often encountered?