What's in Kodak Print Flattener

I recall seeing Kodak Print Flattener in the dark room supplies in the 60s. I found a bottle when going through my chemistry supplies, it came with an old Federal Enlarger I bought a few years ago. Not sure how old it is, it's price at $3.25, if from the 60s that was fair amount of money for 8 oz.

Read this:
https://www.photrio.com/forum/threads/glycerin-print-flattening-solution.161571/

Pakosol is what we used to use... also glycerin based...

The smell brings back memories.

Thanks for the link, must have missed it when I did a search. My first reaction what I had never used print flatting solution, then maybe, in the Air Force when we still using FB paper we had a big tray of the stuff we used before we ferrotype. At one time may have known it was the same as print flatting solution just forgot.