cdnum, This is normally caused by stacking the sheets while the ink is wet during manufacture. Some stamps printed on very thin porous paper will also show this. A third cause can be certain types of watermark fluid can cause the ink to "wick" through, but the images are normally very blurred.
Offsets like that on the Charkhari stamp (first Picasa image) are very common from that set. This is the back of a block of 4 of the top value, the 5 Rupee stamp, from that set:
and here is the front of the block:
It was basically all due to very poor quality control by the printers. There are large numbers of other printing errors in the same set, like this:
and this:
Offsets from more reputable printers are usually scarce, and quite collectible.
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Posted 11/07/2010 5:49 pm
