I got another response. It's nice they ARE responsive. But there's another foible in the reply that is partly my fault. I'd replied back that I understood diacetyl and A/P were not present in the flavors I inquired about, but that the question of acetonin and butyric acid was not answered. This was the response I received:
--begin paste --
In respons to your ticket "acetonin, acetyl propionyl, butyric acid".
Hello
Acetone is not.
Butyric acid is present in all except cream and vanilla
Cordiali saluti/Best regards,
Massimiliano
--end paste
The foible is that he stated acetone is not present but that's a completely different chemical (used in nail polish) and not what I asked about. MY mistake was I asked about "acetonin" when it's spelled "acetoin". Plus we are bridging a language gap. I corrected my mistake and hope they will indulge me one last time so this can be answered.
Again, the flavors he is addressing that I asked about were:
Butterscotch (BA)
Caramel Flavor (BA)
Cream Fresh
Vanilla Classic
Condensed Milk (BA)
... I added "(BA)" to the ones he indicated use butyric acid... which just to re-state is not associated with diacetyl and is not considered so far to be a chemical to be overtly concerned about, but it is listed (in its safety sheet which you can see on TFA's site) as an irritant to inhale, which might or might not be of any concern to readers. It does bother me which is the only reason I asked about it. I just didn't want to buy a bunch of flavors I couldn't vape. But others might be perfectly fine with it.
So we'll see if Cream Fresh and Vanilla Classic use acetoin. If they respond I will update this thread.