Mix the water, sodium hydroxide, and tetrapotassium pyrophosphate and heat to 70 C (158 F). Mix the "Acintol" FA2 Tall Oil Fatty Acid and "Alipal" E0526 and slowly add to the water mixture, maintaining temperature with medium agitation. Continue to complete saponification. Laboratory procedure requires approximately 0.5-0.75 h. Cool and replace water lost by evaporation.