I recently got a new batch of wondfos. I've never had an issue with them before, I could take the test and look at it an hour later and it would be stark white. No evaps or indents ever. I have been using the last of my old batch and some of my new and last night I had a fairly thick, light pink line on a new test but of course it was after the time limit. I took an old wondfo and a FRER this AM and of course BFN. I'm only a little sad. I knew an evap was a possibility given it was after the time limit but I was hopeful. I'm only 10-11 DPO so there is still a chance but I doubt it given its been like 15 months.