should I?

so when i bought the red hair dye i also bought some black hair dye. i was in fact originally thinking of dying my hair black again but thought last minute i would try something new and if i didn't like it i'd dye over it black. but i liked the red sooo now that the red is faded and my roots are growing in brown... i wanna cut my hair short and dye it black.
i mean i already spent money on the dye... i don't wanna waste it by just never using it. plus if i cut my hair short then it will grown in fast and i can hopefully be almost back to brown by the time school starts again.

updated 6/10/07
i've decided not to dye my hair black. but to dye it brown and cut it as to try to get back to my normal color faster.