1900 Great Britain Farthing
Blackened At Mint
NGC AU 55 Brown
Queen Victoria Veiled Head
Obverse: Mature draped bust left
Reverse: Britannia seated right
Starting in 1897, The United Kingdom started blackening Farthings because of their resemblance to the Gold Half Sovereign. An acid gas, sodium thiosulphat, was used to color the coin, this process lasted until 1917.