By 1786, two-thirds of the coins in circulation in Britain were counterfeit, and the Royal Mint responded by shutting itself down, worsening the situation. Few of the silver coins being passed were genuine. Even the copper coins were melted down and replaced with lightweight fakes. The Royal Mint struck no copper coins for 48 years, from 1773 until 1821. The resultant gap was filled with copper tokens that approximated the size of the halfpenny, struck on behalf of merchants. Boulton struck millions of these merchant pieces. On the rare occasions when the Royal Mint did strike coins, they were relatively crude, with quality control nonexistent.