This gives the impression as if in eastern Europe people were only able to live on with old, foreign formulae. Typically eastern research was/is neglected in the West. Partiallly as it not always ended in commercial products. But this again often was not to blame on research.
I'd disagree, Forte evolved their products perhaps not to the same standard as Western companies but they did have help from Bergger after Guillemont ceased trading.
Many of the issue with Eastern Block films were due to poorer emulsion hardening, but I never found that an issue as I'd been used to FP3 and HP3 as a teenager buying cheap ex-Government/Military stock. My experience with Classic Pan/Fortepan 200 is that it's an excellent film. A member here tested it in 35mm for a UK photography magazine and rated it quite highly.
I doubt that the Kodak formulas survived decades of intermittent shortages, supply chain issues, and economic isolation that were characteristic of the economies of Soviet Bloc countries. Was Forte making silver-rich film at the height of the Hunt Brothers era, when an ounce of silver cost more in hard currency than a month’s salary for an average worker? Surely they would have been looking for ways to economize.
Rather like the Tessar lens design these emulsions would evolve and be improved by different companies..
I worked for a family (early 2000's) who's original company went under due to Bunker Hunt, they did all the silver recovery for Ilford, Agfa. Kodak (UK), Fuji (Netherlands), Kentmere etc. As the Silver price dropped the photographic companies wanted money not Silver. In the Eastern Block companies just wanted silver to keep manufacturing. There's a huge recycling of silver from X-ray film and colour labs. The successor company I worked for recovered many tons of silver a year and they'd lost the contracts from the film/paper manufacturers
At the time the prices went sky high I had a company making and coating silver halide emulsions. it was crippling price rises, but even when the silver price dropped there was no corresponding drop by Photo manufacturers.
The stories of what actually happened, bars of silver thrown out over the factory walls as the Administrators went in to declare the company bankrupt I've heard from both sides and they match
Ian