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Curiosity Corner #25: The Machin Confusablity Tests
Australian Stamp News February 1971
BRITISH DECIMALS ~ The United Kingdom will issue a new series of decimal stamps for the introduction of decimal currency in February. There are 12 stamps in the low-value decimal range. Denominations and colours are ½p. turquoise; 1p crimson: l½p charcoal grey; 2p green 2½p pink; 3p bright blue: 3½p grey green; 4p light sepia; 5p pale violet; 6p light green; 7½p light brown; 9p orange and black. These are in addition to the lOp, 20p and 5Op high-value stamps issued in June, and the 1£ stamp. Colours of the new stamps were chosen after extensive tests on 25 colours for "confusability'' at the Applied Psychology Research Unit in Cambridge. Housewives, who had volunteered to take part in the tests, were shown one stamp mounted on a white card for just two seconds, then another stamp. They had to say what degree of similarity there was between the two colours. Later, postmen also joined in the tests and eventually a colour range which would avoid confusion between different values in the sorting office was evolved. Printed in photogravure on white, coated, unwater-marked paper by Harrison and Sons Ltd., the stamps will be issued in sheets of 200. They are the same size and show the same Machin profile of the Queen as the current low-value £sd range. All the stamps will have two phosphor lines except the 2½p which will have one. Perforations are 15 x 14. Every British stamp issued since 1911 - except the decimal stamps - will become invalid for postage within 18 months of Decimalisation Day on February 15, 1971. These include the £1 stamps issued during the reigns of King George V and King George VI. The 1£ Queen Elizabeth stamp has been adopted into the decimal range and will continue to be valid, as will the £1 Windsor Castle stamp. Australian Stamp News February 1971 |
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