Penny Blue
Encyclopedia
The Penny Blue is an unissued type of postage stamp
Postage stamp
A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

 of Britain
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. It is from a series of proof impressions which were made at the time Rowland Hill
Rowland Hill (postal reformer)
Sir Rowland Hill KCB, FRS was an English teacher, inventor and social reformer. He campaigned for a comprehensive reform of the postal system, based on the concept of penny postage and his solution of prepayment, facilitating the safe, speedy and cheap transfer of letters...

 was looking at the new colours which were to be used for the stamps which were to replace the Penny Black
Penny Black
The Penny Black was the world's first adhesive postage stamp used in a public postal system. It was issued in Britain on 1 May 1840, for official use from 6 May of that year....

 and the original 1840 issue of the Two pence Blue
Two pence blue
The Two Penny Blue was the world’s second official postage stamp, issued after the Penny Black.It was issued in the United Kingdom of Great Britain and Ireland and was first sold to the public at the London Inland revenue office in the afternoon of May 8th 1840. Except for its denomination of the...

.

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 decided that the two pence value would remain in blue, this was going to be printed using a different ink from that used on the original. (Thus when the stamp was printed it had the addition of white lines added above and below the inscription so that the new printings could be distinguished at a glance).

At the beginning of December 1840, Rowland Hill wished to see what the stamps would look like in the new colours and requested, (in sheet form), examples in the red brown which was to be used for the new one penny stamp as well as two sheets in blue as the choice of colour had not yet been made. The two blues used for the printing were full deep blue and prussian blue
Prussian blue
Prussian blue is a dark blue pigment with the idealized formula Fe718. Another name for the color Prussian blue is Berlin blue or, in painting, Parisian blue. Turnbull's blue is the same substance but is made from different reagents....

.

For the printing of these three sheets, plate 8 constructed for the production of the penny blacks was used. The choice of plates was probably just one of convenience as this plate was already on the presses being used.

Rowland Hill chose the full deep blue colour for the two pence stamp.

Some of the blue stamps made it onto postage but these are extremely rare. What became of the bulk of the 1840 impression is unknown.

Examples printed in the red-brown shade, if they made it onto postage, would be indistinguishable from later printings which were made in this colour as part of the general issue in 1841.
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