Willing to bet it’s 10mg/ml simply because It’s premixed
juice from a known manufacturer.
100mg/ml is so strong as to be totally unvapable.
It’s not totally impossible I guess that it’s some sort of nicotine/flavoring mix and is designed to be mixed down 10 to one. Seems unlikely in the extreme though.
There’s always the acid test I guess:
vape a tiny bit of it and if it leaves you coughing your lungs out on the floor it’s probably 100mg/ml. Alternately you could mix some down 10 to one with a neutral base and see if it has any flavor at all. Either way there’s a certain amount of waste.
This whole “barreled” vs. “bottled” thing strikes me as weird marketing that manages to help confuse the issue due to the inconsistent strength markings.