Domed Effect. An uneven rising in the background of a numismatic piece that is struck from a sunken die. As dies sink from continued usage (and other causes including nature of the steel and improper hardening) all pieces struck from that die will exhibit an uneven rising in all relief and background. The effect is usually greatest at the center and tapers to the edges of the struck piece; thus giving it an unnatural table from which all detail appears. See sunken die, buckled.

Domed effect is different from the camber in a die which has an intentional domed curvature placed in dies to strike slightly concave struck coins (as an aid to reduce surface wear). See die camber.