Rainbow colour trials 1840
for details see
here
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| Red | Blue |
1840-41 Penny Blacks
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| plate 1a | plate 1b | plate 2 | plate 4 | plate 4 |
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| Dec 24 1840 | Jan 5 1841 |
Stamp colour changes from black to red in 1841
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| Red MX postmark | Black MX postmark |
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| Plate 10 |
Plate 11 |
| Penny reds printed from the same plates used to print Penny blacks | |
For more on the Penny Red see here