Tweaking question?

Elise🌈♥️
When tweaking a test, will an evap or indent have color? I took this test earlier and when I tweak it, it has a faint line. I can see the vvvfl line in person too without tweaking. I'll post a picture of it below but just wondering because I thought evaps and indents don't have color so I'm hoping this is the start of a positive.