Well, I can see right now that I spend waaayyy too much time with my nose in dusty old emulsion books. I'm becoming a fact-checking, fact-arguing geek . Do you ever watch Big Bang Theory? The guys in the comic book store arguing about story arcs? J.M. Eder in 'Modern Dry Plates', 1881, describes ammonia in emulsions. He talks about keeping the temperature not much more than 40C, but notes that Capt.Pizzighelli (Captain Sweatpants!) claims the character of the particular gelatine employed "exercises considerable influence.., while one sample of gelatine will stand digesting for fifteen minutes with ammonia at 70C, another will produce a foggy emulsion if a temperature of 50C be employed." (p21) And, further up the timeline, both Baker and Duffin recommend 40C-45C.
From all that, I'd say you might have been lucky with fog. A novice just starting out might be advised to err on the side of caution and keep the temp low.
Geekfully submitted for your consideration,