flavio81
Member
Then why not buying the eFKe formulas and start making their emulsions again?
The efke formulas were intended for a coating method ("dip and dunk"?) that was old even in the 50s (according to PE). Emulsion formulas are designed for the particular coating method (and even the particular coating machine) to be used, so the Efke formulas would not work on Ferrania's "little boy" coater, which is a completely different coater, apt for E6 film production and able to deposit 8 layers at once.
And, as Dave mentioned before, Ferrania has a huge knowledge base of formulas, likely dating from the 1940s to the 2000s, including the films designed for 3M, including the 3M Color Slide 640T (or the 1000 speed slide) that i would die to have in 120 version to load into my Mamiya.
Efke made slow speed, medium speed and infrared B/W film, and you can bet that the team at Ferrania knows how to engineer such film, and/or do have recipes for them in the database. (I can bet that P30, 33, and 36 were not the only B/W products offered by Ferrania!!)