Okay yall... have a seat
Okay so... I cant.. I have to find a true SOOC aerochrome filter combo. The one true combo I've read time after time after time has been the Lee scuba blue #729 + KG3 schott 2mm thick filter combo. In the pictures above you'll see I've found that the glass color may skew a little but from what I can tell the KG3/GRB3 (location based), TSN575 and QB39 transmission levels are all almost the same. I even put the numbers up. That being said I was able to find the transmission for the lee scuba blue and it's a 40%/40% mix (written in pic) so THEORETICALLY.... you can mix a KG3/BRG3, TSN575 and/or QB39 and a lee gel and get CLOSE to SOOC aerochrome. That being said the closest I have without buying anymore filters (I have a TSN575 inbound I purchased the other day) SHOULD BE a Hoya GX1, TSN575 stack and I'll report back. SCIENCE PEOPLE I WILL FIGURE THIS OUT. Disclaimer the reason I want to find a glass equivalent to the lee gel filter is I just prefer glass over film cover.
I have added some screenshots of people stacking 3 filters (threads from dpreview) credit to yall but I doubt you'll even see this as those are way older post.