MMS Bottle Corrosion?

Hi,
Newbie question...
We've been keeping little MMS bottles in the fridge for maybe 6 months now. The bottles have been used periodically when needed.

However, about two months ago I noticed a white powdery crust had formed around the spout and screw top of the MMS bottles. Makes me think of batterycorrosion?

Is this a bad thing? Is the MMS still safe to use?
We haven't found anything about this anywhere so if anyone has info or knows what causes this, please share.

Just want to make sure the MMS its still safe to use : )

Thank you.

PS: The ACTIVATOR bottles seem fine, no crust.

That white crust is normal and is MMS liquid that has dried. You will find similar crusts on bottles of other solutions. No worry.

Great, thank you for the reassurance : )