He researched recipes and observations of dyers from the 15th century to the 18th century .
In 1998 , through a lengthy trial and error process , an English engineer named John Edmonds rediscovered a process for dyeing with Tyrian purple .
purple researched recipes and observations of dyers from the 15th century to the 18th century .
In 1998 , through a lengthy trial and error process , an English engineer named John Edmonds rediscovered a process for dyeing with Tyrian purple .