Evap Lines Show color?

Hi ladies! Is there such a thing as colored evap lines? In my experience, they've always been a grayish color, and everything I've read says the same. My husband and I just started TTC baby

#2, and I keep getting weird results in my testing window using the One Step Wal-Mart tests. Initially, the test would show a negative result, but when I come back to look hours later, there is a second colored line. It isn't all the way there, and it is "faint," but it's enough that I can tell it is a colored line! I don't know if it's because I'm testing too early still (only 9 DPO) or if this is just how the tests are, but I never had this problem with baby #1 home tests! Anyone have this happen to them?! It's very annoying, but I guess that's what I get for keeping the test around hours after the window 😂 Ps: I put a picture in here for reference. The color might not show up as clearly as it does in person, because my phone camera is awful 😝