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What's the worst that can happen if I skip testing hair dye?

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If i dye my hair without doing a tester what's the worst that can happen? I mean they tell you you should always do the tester but they also say use the product as soon as its opened...so its a waste of product and money....why don't they make little tester sachets or anything? it's useless

so really what's the worst that can happen without doing a tester?????