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Some tests do not get dark quickly. I am not sure about the $ tests but I know the wondfos often do not darken up that quickly. It also might just take another day or two to get a little darker. Even if you number doubles in the beginning they are still small numbers (think 5-10, 10-20 not much difference but 20-40 and 40-80 are starting to get bigger differences). I would not worry quite yet. Take the FRER to ease your mind and KUP!
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