brass is usually an alloy of copper and zinc.
This can vary from 5% to 50% zinc.
The colour then varies from a nice pinkish yellow to a muddy yellow.
the best is a deep drawing brass. 70/30, easy to use with a nice
Make sure its made from new metals and is lead free.
Any non ferrous supplier will give you a data and spec sheet of the
metal on offer.
Usually in 2ft by 4ft sheets half hard.
After polishing, de grease well then use a lacquer.
Theres no permanent way to keep brass shiny.
Its a base metal afterall.