Sometimes when I am mixing colors, I do not always need a full tube of haircolor; yet, by the time I need the haircolor tube again, I find some discoloration within the paste as pictured below. I always try to keep a new tube available in case the pre-opened tube needs to be tossed in the trash.
Typically, it takes 25 minutes or more for permanent haircolor to process. You do not want to waste 25 minutes of wait time, and the haircolor does not provide adequate coverage. It is not worth the customer satisfaction risk. So if it doesn't look right, then just trash it and grab a new tube to open.
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