Mrs. Dorothy Dix of Gloucester, England sued her hairdresser, complaining that after getting a permanent wave from them in July 1946, her normally brown hair turned green. A subsequent effort to bleach her hair back to a normal color worsened the situation, causing it to turn a lighter shade of green, become frizzled, and blistering her scalp.
In fact, her hair was not simply green. Various witnesses offered different descriptions of it, saying it was "like a rainbow with green predominating," "like a dirty sheepskin rug streaked with green," "frizzled like a golliwog," and "streaked with vivid red, brown, green and straw."
The court awarded Mrs. Dix 157 pounds ten shillings in general damages and 12 pounds one shilling and one penny in special damages.
Unfortunately, I haven't been able to find any photos of Mrs. Dix and her green hair.
(left) The Ottawa Journal - Feb 4, 1949; (right) The Winnipeg Tribune - Dec 22, 1948