The root and rhizomes of madder (Rubia tinctorum). Madder is one of the most ancient dyes (it was used by the early Egyptians, and the Greek and Romans). In Medieval times madder root was traded in markets all over Europe – especially in France and England.
With alum mordant, it provides red shades, and with the addition of alkali, you get more pinks shades. It is a wonderful plant to experiment with mordants and pH - you can receive many more shades, from violets to browns!
Check out the photo for examples of colours (all of them were received with the batch of dyestuff currently in the sale!)