Microbacter7 smells like sulfur

[holdyourlight]

I have a bottle of MB7 that i bought last fall. Accidentally stored it in my attic so it's been exposed to really cold and really hot. It has a definite sulfur smell to it. Wondering if this is normal or if the bacteria in the bottle have died
EDIT: I've also read that mb7 can smell like vinegar. This is not a vinegar smell at all. definitely sulfur

 

[Randy Holmes-Farley Verified Community Expert]

It’s probably not very effective any longer, and probably had hydrogen sulfide in it. I wouldn’t use it.