Melt tallow and coconut oil, as previously described.
Cool to leukwarm, by "floating" pan of oil in a tepid water bath.
Stir lye into cold soft water. Cool to leukwarm.
Pour lye into fat, stirring to emulsify. When creamy, add glycerine.
Pour into mold greased with petroleum jelly.
After three days, grate soap into the top of a double boiler. Begin to heat over gently boiling water. Add alcohol and stir constantly. When the liquid is transparent, lift the spoon. If a ropy thread forms, remove from heat. If a skim forms immediately upon removing from heat, pour into molds.
Unmold after a few days and stack to air cure for 2 weeks.