Hair dye
From Tardis Wiki, the free Doctor Who reference
Liz Shaw used hair dye to dye her hair black in an attempt to avoid being recaptured by Pinpoint Division after the Third Doctor helped her escape Colonel Matthews' custody. (AUDIO: Intelligence for War)
Despite the Tenth (TV: The Christmas Invasion) and Eleventh Doctors (TV: The End of Time) bemoaning they weren't ginger, they never considered dyeing their hair.
