I did a transformers test on my hair and left the bottle out over night. Is it still OK to use, will it be as effective?
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If you mixed the dye with the developer, it is no good. If not, it is OK>
Echoing Judy, if you mixed the two parts together, no bueno. However, if its a semi permanent that came in a tube or a tub, it's fine
if you did a test and mixed the solutions then you will need to discard it but if not mixed then it will probably be okay to use but I think you should use it right away.
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