John, I have read formulas by Baker, Wall, Eder and others as well as copies of formulas from the FIAT and BIOS reports posted here. They all have omissions or errors. True, you can make a functional emulsion from them, but this emulsion is not what they made.

One simple reason is that we cannot buy the gelatin that they did. Another is that they don't usually publish addition times. And if you think that is unimportant, see the graph I posted earlier.

A simple published formula such as AJ-12, published here on APUG cannot be tinkered with unless you know a lot about what you are doing or have some expect backup. This is a Kodak formula, but one that can only be made exactly as written.