​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Do evap lines get darker? Thought they had vvvvvfl in the time but then convinced myself they were BFN.