ink to which a clear <#taggant> compound has been added. Phosphored ink is infrequently used on <#stamp=stamps>, but is frequently used for <#poststa=postal stationery>. Example of use of phosphored ink: Leif Erikson stamp of 1968, <#scott=Scott> 1359, and the Bicentennial envelope of 1976, <#scott=Scott> U582.