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Q: Can you use this more than once?

you can try and use half and save the other half for later...just seal the bottle and tube...try to use 50% of tube and bottle...or less if you just want to do the mail part and sides! Do not keep any mixed product.

Q: can you shampoo directly after coloring?

Even though the directions state to just rinse, I always shampoo after coloring and have never had a problem. Though I do usually leave it in for longer than 10 minutes - maybe 20.

Q: do you have to use the entire content of chemicals or can you use partial for touch ups and use the rest later?

I always use partial, I've been doing this for years with no issues.

Q: is that mean, "not" shampooing my hair for 3 weeks?

no, after you apply and leave on for ten, fifteen minutes...or more, you just rinse off and then use a conditioner. I usually shampoo and conditions the next day.