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,
Tyrian shekel Tyrian shekels in Palestine, but with the requirement that the coins should continue to bear the same image and text to avoid objections that the Jews were given autonomy. They were replaced by First Jewish Revolt coinage in 66 AD. The Tyrian shekel were considered tetradrachms by the Greeks, as they weighed four Athenian drachmas, about 14 grams, more than earlier 11-gram shekels but regarded as equivalent for religious duties at that time. Because Roman coinage was only 80% silver, the purer (94% or more) Tyrian shekels were required to pay the temple tax in Jerusalem. The money changers referenced