FOOD 101: Baking Powder History (Where Would We Be Without It?)

http://www.extracrispy.com/culture/3666/the-wild-and-crazy-history-of-baking-powder
https://susanslacktasteofcarolina.wordpress.com/2005/11/05/pearl-ash-a-forerunner-to-baking-soda/
http://www.fourpoundsflour.com/the-history-dish-pearlash-the-first-chemical-leavening/
http://www.stilltasty.com/articles/view/41