Penny Blue Penny Blue The Penny Blue is frequently mistaken for a postage stamp of Britain. It is from a series of proof impressions which were made at the time Rowland Hill was looking at the new colours which were to be used for the stamps which were to replace the Penny Black and the original 1840 issue of the Two pence Blue. The decision to change the black stamp to red had already been made, and at the same time the colour of the ink used for the cancellations was to be changed from red to black. Although it had been
Penny Black people still reused stamps by combining the uncancelled parts of two stamps to form an unused whole, so in 1864 as a further safeguard the top corner stars on the Penny Red were replaced by the lower corner check letters in reverse order. Imprimatur sheets are from among the first sheets of stamps printed from a finished printing plate. The actual imprimatur (Let it be printed) refers to the written permission of the Inland Revenue officials entered on the back of the sheet of stamps. In the 19th century, it was common for officials to remove some stamps from each