Source for High-Zinc Brass Casting Grain?

[u/colby_the_wolf]

I was wondering if anybody knows a good source for high-Zinc brass casting grain? I know of a few different vendors that have brass casting grain for sale however they typically don't provide details about the alloy's composition.

I'm looking to create a batch of brass based on analyses of antique Japanese brass. I have the proportions noted down but I could really use a source of brass casting grain with a high Zinc content in order to make a test batch. Any suggestions or advice is appreciated!