I never have any luck with these POS tests.
I took one this morning though. It was a good PP sample so figured why the hell not.
Dipped the answer test... watched the dye work its way across the window, and instantly, a white line shows where the 2nd line is. It fades after a minute though.
Fast forward 10mins.... and I can see a super super super faint ghost line and I think it's what showed earlier. It must be one hell of an indent.
Doesn't look like it has color. Tried getting a photo and tweaking to bring it up
SIGH. I'll take it apart later once I wake up. If it's an indent, it should be pretty obvious on the backside.