Does anyone have any information on how sour mix rose to power? From various sources, I've found out that its rise started right after Prohibition, but that it really gained steam somewhere between the 1949 and 1972 editions of Trader Vic's Bartender's Guide. Most of what's on Google either (justifiably) decries sour mix or gives ways to make your own from fresh ingredients, but I want to dig down into the acid green, commercially available stuff. Any help is appreciated. Thanks!