How's it possible!

I have used blue dye before and never ever had Evaps. How's it possible that these lines are actually blue in person. Hubby said he sees this mornings more then yesterday's. I go buy a frer non curved pink dye and it's negative?? Makes no sense at all! Literally there is blue in the lines and today's showed before a min. It didn't fill and disappear. The test is dry now obviously, but it's definitely darker then yesterday's. How are people getting positives at 8dpo. I am over here 4 days late!