6 lbs. washing soda.
3 lbs. unslaked lime.
Pour on 4 gallons boiling water.
Let it stand until perfectly clear, then drain off. Put in 6 lbs. clean
fat.
Boil until it begins to harden—about two hours—stirring most of the
time.
While boiling, thin with two gallons of cold water, which you have
poured on the alkaline mixture after draining off the four gallons.
This must also settle clear before it is drawn off. Add it when there
is danger of boiling over.
Try the thickness by cooling a little on a plate. Put in a handful of
salt just before taking from the fire. Wet a tub to prevent sticking;
turn in the soap and let it stand until solid. Cut into bars; put on a
board and let it dry.
This will make about forty pounds of nice soap; much better for washing
(when it has dried out for two or three months) than yellow turpentine
soap.