Tyrian purple 520 nm, which is green). It is believed that the intensity of the purple hue improved rather than faded as the dyed cloth aged. Vitruvius mentions the production of Tyrian purple from shellfish. In his "History of Animals", Aristotle described the shellfish from which Tyrian purple was obtained and the process of extracting the tissue that produced the dye. Pliny the Elder described the production of Tyrian purple in his "Natural History": The most favourable season for taking these [shellfish] is after the rising of the Dog-star, or else before spring; for when they have once discharged their waxy secretion,
Edward VII 2d Tyrian plum Edward VII 2d Tyrian plum The two pence (2d) Tyrian plum was a postage stamp produced by Britain in 1910 as a replacement for the existing two colour 2d stamp of King Edward VII. One hundred thousand sheets, totalling 24,000,000 stamps, were printed and delivered to the post office stores for distribution to postmasters. The circulation of the new stamps was delayed while existing stocks of the current stamp were used up so that the change would take effect at one time and the amount of surplus stock of the old value would be kept to a minimum. However following