the Elder Pliny, The Boys' and Girls' Pliny
“ The tint that inclines to red is looked upon as inferior to that which is of a blackish hue. The wool is left to lie in soak for five hours, and then, after carding it, it is thrown in again, until it has fully imbibed the color of that bright lustre, which approaches the shining crimson hue of the kermes-berry, a tint that is particularly valued. ”
