a <#platevar=plate variety> in which a portion of the <#design> is doubled, that is, it appears twice. A double transfer occurs on <#engraving=engraved> stamps when a design is "<#rocking=rocked>" into a <#plate> from a <#tranroll=transfer roll> in such a way that the rocked images are out of alignment. Thus, if the <#siderographer> is not careful, the rocking in of the design will cause a part of the design to appear more than once. Sometimes a double transfer on a <#plate> is discovered and is "<#burnish=burnished>" out. But if this process is not totally successful, some amount of doubling of the design may remain. All sheets printed from a plate with a double transfer will show the double transfer. Thus, the double transfer will be a <#constvar=constant variety>.