Was Van Gogh color blind?

1) No.

However, it has been suggested that his color perception could have been altered for various reasons:
"Medical theories have even been proposed to explain Van Gogh's use of the colour yellow. One theory holds that Van Gogh's colour vision might have been affected by his love of absinthe, a liquor that contains a neurotoxin called thujone. High doses of thujone can cause xanthopsia: seeing objects in yellow. However, a 1991 study indicated that an absinthe drinker would become unconscious from the alcohol content long before consuming enough thujone to develop yellow vision. Another theory suggests that Dr. Gachet might have prescribed digitalis to Van Gogh as a treatment for epilepsy. There is no direct evidence that he ever took digitalis, but he did paint Gachet with some cut flower stalks of Common Foxglove, the plant from which the drug is derived. Those who take large doses of digitalis often report yellow-tinted vision or yellow spots surrounded by coronas (like those in the The Starry Night) and changes in overall colour perception."
Source and further information:
http://en.wikipedia.org/wiki/Vincent_van_Gogh#Medical_records

Further information:
http://en.wikipedia.org/wiki/Vincent_van_Gogh's_medical_condition


2) "Though some careers are off-limits to the colorblind (perfect color vision is required of pilots, firefighters and electricians, among others,) there are many successful role models to inspire colorblind kids. The actor Paul Newman is colorblind, as was children's television pioneer Fred Rogers. Don't rule out a career as an artist—Van Gogh and Renoir are thought to have been had color-impaired vision. "
Source and further information:
http://www.rps.psu.edu/probing/colorblindness.html


3) "Was Van Gogh Color blind?"
http://de.new.facebook.com/topic.php?uid=2207669194&topic=4016


4) "Blind and visually impaired people work in different styles and use different media, ranging from sculpture to photography. People who have lost their vision or have partial vision include famous artists such as Monet and Van Gogh."
Source and further information:
http://www.artbeyondsight.org/change/aw-faq.shtml

Van Gogh wasn't color blind.