Post Stamp | 8 Oct 2009

shabbir's Avatar, Join Date: Jul 2004
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When stamps started in 1840 it was all black but soon was changed to Red and can you find the reason why?
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sameer_havakajoka's Avatar
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It was changed to red ink to make the cancellation marks much easier to distinguish.
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sameer_havakajoka's Avatar
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it was difficult to see a black postmark on a black stamp the color was changed to red in 1841. It was a matter of concern that there was a possibility that the cancellation might be removed from the used adhesive stamp. Many experiments were made to produce a black ink which could not be removed. On 21st July 1840 Rowland Hill wrote that one:

'Mr Donovan, a chemist of Dublin had succeeded in removing not only the black but also the red colour of the obliterating stamps.'
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shabbir's Avatar, Join Date: Jul 2004
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nimesh's Avatar, Join Date: Apr 2009
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nice question