Stupid blue dye...Evap or VFL...

So I know that blue dye are notoriously known for giving evap lines, but it’s all I had in the house and I wanted to test this morning. I still had a pack I accidentally picked up thinking they were pink. I enclosed a picture of the test during the first three minutes and then what it looked like the morning after. The line is very very faint in the first photo and does have color, but it’s hard to see. The next morning, it’s a very clearly a blue line?! Thoughts? I will be retesting with pink in a few days. Each picture has a negative version underneath. Don’t know if blue dyes work with the negative or not.