At least 99.5% pure gold or silver is called bullion. Pure bullion is also called parted bullion because to create pure bullion first you need to apart it from mineralized rock. Gold or silver bullion is available in bars, ingots, or coin forms. Bullion is primarily reserved by central banks and investors. Investors invest in gold and silver bullion via futures contracts or exchange-traded funds (ETFs). Bullion is sometimes used as legal tender and reserved by the central bank or institutional investors. Bullion is used to settling the international debt or stimulate the economy. Central banks lend bullion for a specific period to bullion banks in exchange for money. Bullion banks can sell this bullion or lend it to mining companies. Bullion banks sell bullion in the spot market in exchange for cash and lend gold to mining companies to run their project. Inflation is controlled by gold and silver bullion when rising prices or inflation are high. The price of gold and silver rises and falls according to the demand of the spot market. There are various ways to purchase and invest in gold and silver bullion such as physical form, Exchange-Traded Funds (ETFs), futures contracts, etc.