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Lye content depends on fats employed. Page 431 ...The density of the lye necessary to saponify with a fat depends on the type of fatty acids it contains ; coconut oil, for instance, requires a stronger concentration of lye than tallow to accomplish saponification because of its high lauric acid...

They could have used non common fats/chemicals mixtures which could be proprietary to obtain high lye ratio. Doesen't a high lye content mixture shorten saponification duration?

I heard a while ago service personnel (soldiers) are provided with lye soap ranging to =>70% lye solution. Obviously those personnel need to be clean in a hurry with the most potent soap there is. Is this lye concentration to speed up the saponification process to increase soap yeild or to...