Why can't they be darker!!

Question

So I took a test yesterday and had a faint line, I could definitely see it, but I've taken 3 tests this morning, and I'm really not sure, I swear I can see something, but I'm just hoping for some opinions please all3 below

Answer

This was after settled x

Answer

They're all dye runs. Those test didn't finish processing the dye

Answer

I'm in the uk haha, but will be getting a different brand tomorrow xx

Answer

Faint positive probably should test again. Try testing with a Dollar Tree test

Why can't they be darker!!

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