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,
HMS Tyrian (R67) HMS Tyrian (R67) HMS "Tyrian" was a S-class destroyer built for the Royal Navy during the Second World War. "Tyrian" displaced at standard load and at deep load. She had an overall length of , a beam of and a deep draught of . She was powered by two Parsons geared steam turbines, each driving one propeller shaft, using steam provided by two Admiralty three-drum boilers. The turbines developed a total of and gave a maximum speed of . "Tyrian" carried a maximum of of fuel oil that gave her a range of at . Her complement was 170 officers