test result validity

[bobbyj206]

Does anybody know if the test results from the api master test kit have an expiration?
And by expiration i mean, will the test results continue to change color even after the 5 minute wait?

 

[Samzter]

Yes they will continue to change colour. Or at least mine do.

 

[jlk]

Just check them at the 5min mark for valid results. I have never noticed the nitrite, nitrate or ph test changing color even when they have sat for days but the ammonia test will turn from yellow to more of an orange color.