Re: 2nd attempt
Consistency is the main reason. I have had some colors that only took 30 seconds to 1.5 minutes. The temp effects the dye absorption. There have been a few posts stating the dye worked at room temp but many posts concerning dye problems that were rectified through an increase to the recommended temp. The recommended temp of 140* was made by the people that designed and manufacture the dye. It's one of those things that you may get away with for awhile but will cause problems sooner or later.
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