Why is marge simpsons hair blue?

Answer 1

yes and no because as a young girl she had blue hair it did go brown once only because she over ironed her hair

but in one Simpson episode she had green hair and a blue dress

but she is said to originally meant to be grey

Answer 2

she doesnt - its a tv character

yes she's a tv charicter but in the cartoon its because her hair turned grey when she was 17

Answer 3

to add character

Answer 4

she dyes it regularly