A.Veins appear blue because of the way that light is diffused by the skin. Deoxygenated blood is dark red in colour, and oxygenated blood is bright red.
Q.Wats the real couler of guinness
A.Guinness is an intense dark red; hold a pint up to a bright light and you'll see it. The clearer red of Guinness Red is made by roasting the barley less.
Q.What is the colour of lobster blood?
A.Lobsters have clear blood. It turns blue on contact with air. The colour comes from the blue copper-containing haemocyanin molecule which carries oxygen.
Q.What couler is poo ?
A.The colour of poo is always brown because of a pigment in it called bilirubin. The world's longest recorded poo was 66cm long.