How old is ancient briton woad grinder?

The ancient Briton woad grinder, a tool used for processing woad, a blue dye made from the leaves of the Isatis tinctoria plant, dates back to the Iron Age, around 600 BCE to 43 CE. Archaeological evidence suggests that woad was used in Britain for centuries, particularly by the Celts. Thus, the woad grinder itself can be considered over 2,000 years old, reflecting the practices of early British cultures.