Hey kiddo, have you heard of something called mosaic gold? It's actually a type of substance that people use to make beautiful designs on objects, like jewelry or pottery.
Now, mosaic gold is actually made up of a couple different things. The main ingredient is something called brass, which is a type of metal that's made from copper and zinc. Copper is a reddish-brown metal that you might have seen before, and zinc is a silvery-white metal that's also pretty common.
To make mosaic gold, people mix brass with something called "tin salt" and heat it up really, really hot in a special furnace. This makes the brass and tin salt react and form a new substance that looks kind of like gold! That's why they call it "mosaic gold," because it can be used to make things look like they're covered in tiny little pieces of shiny gold.
People have been using mosaic gold for a long time, even back in ancient civilizations like the Greeks and the Romans. Some people even used it to try and make counterfeit gold coins! But nowadays, we mostly use mosaic gold for decorative purposes, like making beautiful jewelry or ornaments. It's a really cool substance, don't you think?