Wikipedia says: > In 1998, by means of a lengthy trial and error process, a process for dyeing with Tyrian purple was rediscovered.[37][38] This finding built

Wikipedia says: > In 1998, by means of a lengthy trial and error process, a process for dyeing with Tyrian purple was rediscovered.[37][38] This finding built on reports from the 15th century to the 18th century and explored the biotechnology process behind woad fermentation. It is hypothesized that an alkaline fermenting vat was necessary. An incomplete ancient recipe for Tyrian purple recorded by Pliny the Elder was also consulted. By altering the percentage of sea salt in the dye vat and adding potash, he was able to successfully dye wool a deep purple colour.[39] So in that regard, the article seems not entirely correct.