>> The other is almost entirely a mixture of Propylene Glycol and Vegetable Glycerin.
> What an extraordinary meaningless statement.
>> ...except when it isn't
Emphasis on "except when it isn't" which highlights the other impurities that might be there. I found the comment to be useful at highlighting what it was designed to highlight - that the safety depends entirely on what's inside the carts. You have no guarantees with some suppliers what the heck's actually inside, and I think saying "it's fairly simple at the base, but rather complicated in reality" is quite helpful for framing.
> What an extraordinary meaningless statement.
>> ...except when it isn't
Emphasis on "except when it isn't" which highlights the other impurities that might be there. I found the comment to be useful at highlighting what it was designed to highlight - that the safety depends entirely on what's inside the carts. You have no guarantees with some suppliers what the heck's actually inside, and I think saying "it's fairly simple at the base, but rather complicated in reality" is quite helpful for framing.