well, i wonder if this product can be used, and the leftover solution stored say for two or three weeks and then used again when the hair is cut? my hair is short, and the application is more than enough if i cut it in half. would it store correctly? do you need to add more hydrogen peroxide? i mean, it is cheap ($7) compared to say getting it done at the salon ($35) so i am not complaining,but i would be more apt to touch it up every 3 weeks when i get my hair cut

sam