Alternative Method for Making Lye, Part 1

     This is an excerpt from a chemistry text, written in 1856, called "A Treatise on Chemistry Applied to the Manufacture of Soap and Candles: Being a Thorough Exposition, in All Their Minutiae, of the Principles and Practice of the Trade, Based Upon the Most Recent Discoveries in Science and Art."
     I have taken enough college chemistry classes to realize that I never could seem to find the useful parts of the chemistry books. Perhaps because they didn't come with those chapters. But here is a small bit of a nifty chemistry which can be done at home to work-around the lack of available lye sources for home soaping.
     I love antique cookbooks and now, chemistry books. They provide a new perspective that is absent in our modern age.
     Read more for a more practical method breakdown. Do home chemistry at your own risk. Never throw salt in your eyes.
     What is soda ash? What is hydrated lime?

What is hydrated lime, really?

     Hydrated lime is a builder's concrete additive and a soil amendment. The high calcium, low magnesium (non-dolomitic) type can also be used for making a home-made version of sodium hydroxide by following the methods outlined here.
     The pure form of the chemical is known as calcium hydroxide (Ca(OH)₂) or slaked lime. It's pH is a high 12.4. Aglime and hydrated lime are frequently confused, but are chemically completely different. Aglime is crushed limestone (calcium carbonate).

     As a soil amendment, it is a cheap way to raise the pH of large amounts of overly acidic soil. In aquaponics and hydroponics, it can be used to safely raise adjust pH and add calcium to the closed systems, though some people would just add seashells to their system. There are several grades of hydrated lime for the garden, a high calcium grade, a medium calcium grade, and a dolomitic grade. These three are all varying degrees of magnesium added, with the high calcium having the least, and the dolomitic having the most.

    For the soap lye synthesis plan, I have found the highest calcium grade hydrated lime for the best price at the Sears website, of all places. Five pounds of 95% calcium for $13.63, free shipping. That's even cheaper than Amazon!