[Nevermore]

I have some liquid bromothymol blue that's probably 3-4 years old. I'm wondering if it's still good.

 

[HeyPK]

I've had it for many years in solution, and it has shown no change . As long as it is colored, it should be good. If it turns colorless, then it is bad. I would not worry about it.

 

[Nevermore]

Great! Thank you.