Originally Posted by GwenInNM
I did hold it up to natural light, and ran the test twice. I guess since it is darker than the card, I still have a trace of nitrites, but not up to .025 - almost there!!
Could be. I've forgotten from the last time i did a nitrite test, was years ago... You were careful about the number of drops? I have had an additional drop slip out in pH tests, and of course that makes the test useless. You also need to hold the regent bottle vertical so the drop is the right size. Pardon me if this is all known...but it can vary the results a lot.