Say goodbye to the 90/10 mix of silver coins from the United States Mint. The agency is now producing silver coinage to 99.9% purity.

The increased silver composition will be used for dimes, quarters, half-dollars, and commemorative dollars.

"In 2019, any previous 90/10 silver denominations have moved to 99.9% silver, including Silver Proof Half Dollars, Silver Proof Quarters,Silver Proof Dimes, and Silver Proof and Uncirculated $1 Commemoratives," U.S. Mint spokesman Michael White told CoinNews on Tuesday, Feb. 19."All other coin compositions remain the same."

The 90% silver and 10% copper ratio is often referred to as "coin silver." The mix was a mainstay of U.S. circulating coins from theearly 1800's until the Coinage Act of 1965 became law. Its use returned in 1982 for modern commemorative coins and in 1992 with the introductionof annual silver proof sets.

Actually, until President Obama signed the FAST Act in December 2015 which replaced the traditional 90/10 language with "not less than 90percent silver," the U.S. Mint by law had to produce silver coins for numismatic products like the annual sets in 90 percent silver.