Like, under a certain type of bright light, you can see it super super super faintly, but it's not clear if it's an effect of the reagent soaking the strip and changing its opaqueness, apart from its maybe causing the dye there to come to the surface.
This happened twice over two days, with the same style of test.
. . .
(Several days later beyond that, a different style of test showed me being clearly negative.)
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