They started using color for the Third Doctor (1970).
White
Bella's eyes were red at first but then they turned golden after feeding multiple times.
Green
In 1970, with the first Doctor 3 adventure, Spearhead From Space.
Dark brown when she was young and turned light brown as she got older and eventually turned white
Snow
The first episode of Doctor Who to be broadcast in colour was the first part of the Third Doctor's first story, 'Spearhead from Space', broadcast on the January 3rd 1970. Since then all episodes of Doctor Who have been broadcast in colour, with the 50th anniversary special, 'The Day of the Doctor', being the first adventure to be broadcast in 3D on November 23rd 2013.
You can't at home, see a doctor possibly they can fix it
conducting that experiment, hexane turned a fushia/purple colour
after it is burned the colour will drain and it will become black because it has turned into ash.
They say 'hey, who turned out the lights'.
vaginal discharge can vary in colour, thickness and amount during pregnancy. if you have any concerns see your doctor