just thought I would bring up a subject that many stamp collectors ignore or don't realize exists...RAISED LETTERING ON STAMPS
The definition of raised lettering is as follows..."Raised lettering is done through a special technique used by off-set printers. They apply a Thermographic powder to wet ink on a stamp sheet and they react to each other causing the bubble effect"
While I was in high school in printing class, I did this many times on business cards, wedding cards, etc...The technique is exactly the same for stamps.
Immediately after the stamp sheet has been printed and before it lands on the previous sheet a nozzle spray a very fine dark power on the printed area...It reacts immediately to the chemical and bubbles up to form raised lettering.
You can feel the deference and see it also..One easy way to tell if it have been raised is to look for small pot holes on a letter which was a bubble that burst and became concave.
Below is a random stamp I used to show the raised letter effect. look at this Newfoundland Scott 156..
Below is a close up of the same stamp...The left brown line is the exact same colour as the left red arrow is pointing to..The difference in colour is caused by the powder reacting to wet ink.
The 5 brown arrows in the middle shows the highlights of he raised lettering (tops of the lettering)..The far right red arrow shows again the original colour printed as shown by the picture below.
Now having said that, here is a shocker for you
.. My printing experience tells me that this stamp and other were sent trough the printing press twice
...The lettering to be raised was printed first to get the raised lettering affect...Then ran trough the presses again to finish the rest of the stamp...The reason I know this to be true is it is impossible (IMPOSSIBLE
) to achieve an exacting fine spray to get this wanted affect on such tiny areas...It looks like two different colours on this stamp, BUT they are exactly the same, just one is chemically affected.
Hope it sheds a bit of light on a print effect that has been lost over time