That's an indent sorry ,it has no colour,when it sits out too long it leaves a white Streak that's negative 😔
I think that's an indent. If it's white or grey in colour normally indent. 🫂
White means it's an indent, not a positive sorry
If it isn’t pink it isn’t positive. Most likely an indent line
Could be a faulty test I'd try again with another test like that or a strip test