A more thorough explanation:

Definition: Brassage is a historical government charge for the actual cost of coining metals. Any profit made from this charge is called seigniorage.

Seigniorage: Seigniorage is a prerogative of the Crown, which means it is a charge for coining bullion into money. It is also a royalty and a profit.

Example: In the past, when people wanted to turn their gold or silver into coins, they had to pay a fee to the government. This fee was called brassage. The government would use this fee to cover the cost of making the coins. If the government made a profit from this fee, it was called seigniorage.

Explanation: Brassage was a way for the government to cover the cost of making coins. It was a fee that people had to pay if they wanted to turn their gold or silver into coins. The government would use this fee to pay for the materials and labor needed to make the coins. If the government made a profit from this fee, it was called seigniorage. This profit was used to fund other government projects.