Update: I think it would be to early to test right?i tested with two 88 cent brand test from Walmart and a very faint line showed up on both and after time limit it stayed the same maybe just a lil darker but very light but when I tried first response it was negative I’m not sure if what I saw was faint line but I don’t think after a couple hours of the response that line showed up I’m guessing it’s evap line