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Blue food coloring. .
Fingers and feet turn blue in the elderly because these individuals have poor circulation. The blue color is the effect of the area becoming cold.
The exhaust is stainless steel. Heat causes stainless steel to turn blue.
because there blue
Your feet turn blue-purple when they do not get enough blood flow or when they are lacking circulation or some times they are cold the best thing to do is rub them or run them under warm water.
100,000 feet.
Sounds rather like poor circulation. Lack of oxygen in the feet (or elsewhere) could cause cyanosis, and that makes the skin look blue. When the blood supply has been cut off from, say, the feet, and then returns, tingling is sometimes felt.
Bleaching you hair because black dye has alot of blue in it. Yellow and blue makes green.
A Rash, Hives, Or an Infection.
Your nail turns blue when the blood clot in it.
No a carrot can not turn you blue.