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In this way, how long does Kool Aid last?
For lighter hair 15 minutes will do, but for brown to black hair 20-30 minutes. The longer you leave your hair in the more likely it will be brighter and last longer. The color should typically last 2-4 weeks depending on how often you wash it.
Similarly, you may ask, does Kool Aid really expire?
So in conclusion, Kool Aid powder (in the packets) seems to be just find to drink as long as it does not have the sugar already added (sugar is not safe to consume expired).
No. While Kool-Aid can be very messy, will instantly drip all over you if you get caught in the rain and may destroy clothing, towels and bedsheets, it is not damaging to hair. It's just a major pain to use, it doesn't last long and depending upon your base hair color, it may not show up very well.