Walnut 50g
Extracted from walnut hulls, this dye gives a rich brown.  A mordant is not needed, but alum can be used to alter the colour (usually gives a more yellow - brown hue). To develop the colour, the extract needs to be simmered for 2 hours and left overnight before adding the fibre.
50g walnut extract dyes up to 250g wool to a dark shade with an exhaust bath that can be used for multiple lighter shades.
Try this!  Over dyeing with madder to get a rich burgundy.