Why are cold and semiboiled soapmaking methods suitable for small factories?

The cold and semiboiled methods are highly suitable for small factories primarily because they are technically simple processes that require very little investment in machinery.1

In the cold method, a mixture of fat and oil is combined with an alkali solution and agitated in an open pan until it thickens, after which it is poured into frames to solidify. The semiboiled method is similar but involves heating the mixture while stirring, without reaching a boil, before it is poured into frames to saponify and solidify. Because these methods avoid the complex, multi-stage boiling process used to purify soap and recover glycerin, they are more accessible for smaller-scale operations.12