Odd Color Change when Testing for Chlorine

[waterbear]

I have seen the LaMotte reagents turn that color on the FC test after standing a few minutes. LaMotte says the FC should be read within 30 seconds of performing the test. From the reagent numbers I see you are using the Taylor reagents. I have not experienced that with them but I am going to test tomorrow and let the test sit to see if it develps the same off color I have seen with the LaMotte reagents. Might be normal, especially if the DPD solution is getting old.

[RudyandRocky]

I bought new reagents and my chlorine readings are much higher and it doesn't turn the funny color. Interesting, because the reagants weren't very old.

Anyways.............now I know what to look for.

Thanks!
Mickey

[waterbear]

DPD reagent #2 does have a shorter shelf life than the rest of the reagents in the test.