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Evap line, indent line what is it?

I took a blue dye pregnancy test 3 days ago and there was a thin blue line that was really faint and only really noticeable near the light. I took another blue dye test the next day and it was the same thing, I took same pink dye test yesterday and it was negative and no line. Same thing this morning.? But my question is I thought evaporation lines or indent lines were white or grey ? What could have causes the blue lines? I don't get it. I even took the test apart to see if I was imagining the lines being there and they were there.

Update:

Also, they all showed up in the time

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