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How long does box hair dye last after it's all mixed?

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Boxed hair color once mixed does not last long, maybe an hour but you must use it as soon as it is mixed because the longer it sits the less strength it has. Also, once you have used the color you must discard the remaining color in the bottle and do not re-use it.

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As soon as it's mixed, it starts oxidizing. It needs to be used asap.

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It needs to go on the hair immediately after it's mixed. It's no longer viable after it's oxidized which begins after it's mixed up.

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mine sat for a day... the next day i dyed my hair and it came out fine. its been 3 weeks and still looks perfect!

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