First Steps In Natural Dyes - Joan Almon
Crafts & Activities; WECAN (Waldorf Early Childhood Association of North America)
This is a wonderful resource book for anyone wanting to use natural dyes. It includes sections on understanding and choosing dyes, equipment, preparing the fabric, and dyeing with cochineal, madder, brazilwood, fustic and indigo.
There's a helpful section on possible problems, and information on further reading.