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About used ink quantities...
Finding the same stamp with different
colors isn' t rare in case of some printing ways.
Here is, as an example, a rhino stamp that shows two colors (they
have been scanned together and no filter or so has been used).

Those different colors are mostly due
to the ink quantity.
Here after are the two other stamps of this French Equatorial
Africa series:
Different ink quantities also show ink spots or turn the white
paper coloured...

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