If I open a bottle of hair dye to do a test strand and close it can use it a month later?

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  would these colors look good in black hair?
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  how and where do i get the blonde streaks in my hair like jack barakat?
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  bleached my black hair and then dyed it with splat,it turned green my aunt will dye it back to black today.will it turn gray? be healthy?
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  For those who have used Garnier Nutrisse Ultra Color in R3?
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