I am trying to remove the greenish-gray from my hair that resulted from me coloring my lite blonde hair a dark brown. Clairol said to 1st use a reddish tone with only the #1 bottle (color seal), then a combo of a brown (bottles 1 & 2) mixed with my shampoo. Just a little reluctant to use only the #1 bottle w/o mixing it with anything. Is this OK?