saleratus

It is 60 like the saleratus which the pioneers used to cast into their barrels of Missouri River water, to precipitate the silt and make it clear.

From The Rustler of Wind River by George W. (George Washington) Ogden

Some use bolted meal; most raise bread by fermentation; many use salt; some saleratus, or carbonate of potash; and, in the country, many use milk instead of water to form the paste.

From Vegetable Diet: As Sanctioned by Medical Men, and by Experience in All Ages Including a System of Vegetable Cookery by William A. (William Andrus) Alcott

At Philadelphia in 1876 Vienna bread was made known, and the native article, sodden with saleratus, which up to that time had desolated the country, 360 began to disappear.

From The Teacher Essays and Addresses on Education by Alice Freeman Palmer

Same as Walnut or Hickory-nut; but use no molasses, and when done, set off and stir in one teaspoon saleratus; mark into sticks.

From Frye's Practical Candy Maker Comprising Practical Receipts for the Manufacture of Fine "Hand-Made" Candies by George V. Frye

Some people use only a tea spoonful of saleratus, to a pint of molasses, but it is much better with more, appearing in point of lightness like sponge cake.

From The New England Cook Book, or Young Housekeeper's Guide Being a Collection of the Most Valuable Receipts; Embracing all the Various Branches of Cookery, and Written in a Minute and Methodical Manner by Anonymous