ANSWERS: 4
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No I believe once it's opened it's no good to use later. That is what it said on mine.
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Don't mix up the whole bottle with the developer for the test strand. Just mix a dot of each on a glass saucer and do the test. Opening the bottles does not ruin the color. If you reclose them and store in a cool dark place they'll be fine. Once the developer is mixed in with the color you have to use it right away.
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Why would you wait a month after you did your test strand? If you mix the contents of both, it will be bad a month later.
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its toxic after about 24 hours, unless its something like colourpulse mousse that comes premade in a mousse form.
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