Did it show in the time frame? If so then I'd say it's unlikely to be a fake. If blue tests DIDN'T work then they wouldn't be sold. And the FR may have been negative because of the time of day you took it! Take a test again in the morning!
Blue dyes are notorious for evaps but I find them more sensitive than frer. Same urine and my blue dye was easy to spot while frer I had to squint so shrugs. FXed!
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