Rhubarb will give you three colours, earthy green, pink/red & straw yellow. Yellow is the original colour, Pink/red can be achieved by bringing the PH up and green by including an iron mordant.
This recipe, PDF, walks you through the steps of home dyeing with Rhubarb Dye on wool and silk.
Is your yarn or fabric wanting the goodness of Rhubarb too? Looking for Rhubarb dye supplies? Not sure your calculations are correct? Contact us! ~ Or pick up the Rhubarb Dye Kit for Wool and Silk here.