Dollis Hill 2d Yellow AOP plus Blue AOP Dummy Stamps on a postcard

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£547.40

SKU: M257281

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YELLOW AND BLUE PHOSPHOR EXPERIMENTS. The Forster files contained a small number of covers (used 1972) with 2d light red brown trial stamps and dummy stamps. Effectively these combinations were phosphor paper used for experimental purposes. Other foreign postal services have issued stamps with different phosphor colours reacting to different wavelengths of Ultra Violet Light. 2d light red brown with Yellow all over phosphor used in combination (at left) with part of a dummy Blue phosphor stamp. Ex Edward Klempka Author of the DOLLIS HILL FIND illustrated on page 35