Expiration dates for some reagents

[surfhawaii]

I've noticed that three reagents don't have expiration dates on them: R0010,R0011L and R0012. I learned a lesson in not watching the expiration date on the CYA reagent I was using one time and it caused me lots of problems. I just want to make sure that I don't use something that may have expired but these bottles don't have any dates.

Do they expire and/or should I just go ahead and replace them anyway, they are at least four-five years old.

Thanks, Ben.

 

[Rancho Cost-a-Lotta]

I generally have confidence in my reagents for about two years, unless they show some signs of degradation or provide some wacky results. Four to five years is too long. Probably a good time to reorder some reagents.