How can I fix a bad red dye job?

Two days ago I colored my normally light brown hair red. Unfortunately it came out very very dark red and it looks fake. Almost purplish in spots. The box color was a dark auburn. I've dyed it medium auburn before with success. If I buy a medium auburn and dye it that will it help? Is it too soon to... show more Two days ago I colored my normally light brown hair red. Unfortunately it came out very very dark red and it looks fake. Almost purplish in spots. The box color was a dark auburn. I've dyed it medium auburn before with success. If I buy a medium auburn and dye it that will it help? Is it too soon to re-dye it? Also, I've already conditioned my hair today and they say not to do that before dying it, but I would like to fix it before tomorrow. Any suggestions?
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