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Derwent Colour Blocks introduced. |
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Elizabeth II ascends to the throne. |
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Derwent Colours reformulated using non-toxic materials. |
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Received certificate from Royal Institute of Public Heath & Hygiene. |
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DES memo 2/65 set out limitations on use of heavy metals in pencils supplied to schools. |
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England wins the World Cup. |
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Decimalisation. |
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Pencil & Graphic Instruments Safety regulations - safety limit set on use of heavy metals in all pencils. |
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Taken over by Twinlock and renamed Cumberland Graphics. |
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Development of Colourland pencils in 36 colours. |
