So, to sum everything up. I took a cheapie last night. I thought I saw a little line after 5 minutes and by 15 minutes I saw a line. Overnight it got dramatically darker. So I compared it to the test I did a month ago, to rule out any Evaps. But it looks much much darker than the one done a month ago.

All above pictures are from 3min to 15minutes.

Now here is the comparison from that test this morning to a test I did a month ago:

Left was last night: right was exactly a month ago.