To make Hard Soap
Pour 3 gallons of boiling water on 5 pounds of sal soda [sodium carbonate]. Pour 3 gallons of boiling water on 5 pounds of unslacked lime. When the soda is dissolved, pour it on the lime; stir them well together, set it aside until the next morning, dip carefully off the clean liquid, leaving the sediment; pour the liquid into a pot, add 3 ½ pounds of clean grease and 3 ¼ pounds of rosin; boil steadily for one hour, and then pour it off to cool in any mould.
Source: Fayetteville Observer, August 4, 1864 as found on www.ncecho.org