A reverse proof coin is a type of coin that is struck in the same manner as a normal proof coin, except that the fields are frosty and the raised devices are mirror-like. In other words, the design on a reverse proof coin appears like the negative of a black and white photograph, with a frosted field and a mirrored device. The term "reverse proof" does not mean that only the reverse side of the coin is struck in the Proof finish. The entire coin is in proof finish, with the term "reverse" stemming from the fact that the fields are frosted rather than the devices. Reverse proof coins are often released in conjunction with special anniversaries and are considered more beautiful and valuable than their standard counterparts. The first reverse proof coin issued by the U.S. Mint was the 2006 Reverse Proof American Silver Eagle, released for the 20th anniversary of the series.