YOU SAID:

My hair is the color blue

INTO JAPANESE

私の髪は色は青

BACK INTO ENGLISH

My hair color is blue

INTO JAPANESE

私の髪の色は青

BACK INTO ENGLISH

Blue is the color of my hair

INTO JAPANESE

青は私の髪の色

BACK INTO ENGLISH

Blue is the color of my hair.

INTO JAPANESE

ブルーは私の髪の色です。