Here is some information from the Caron Threads Website. Check out their site for great free pattern and to see their entire line of threads ... I am able to order anything you would like.
Going Green might be the byword today, but we’ve always been green, says Lois. Our dyes are environmentally safe and the mordants we use (the substance that helps the dye reaction take place) are earth friendly. Except for computers for record keeping and invoicing, we are technologically back in the 17th century. We work with no machinery. Although labor intensive, the variegated threads continue to be hand-dyed because the subtle color combinations just can't be matched by commercial dyeing methods. The threads are air dried and hand wound into small skeins.