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1. Beauty and Hygiene (1911-1956) - Ad*Access Research Guide - LibGuides at Duke University

   https://guides.library.duke.edu/c.php?g=480747&p=3321103

   For many centuries, and into the nineteenth, a whitening agent for the face was used and composed of carbonate, hydroxide, and lead (...)

2. The Goodson Blogson

   https://dukelawref.blogspot.com/2015/07/

   Hopkins received the first U.S. patent, signed by President George Washington himself, for his method of manufacturing pot ash and pearl ash, (...)

3. America's First Patent: 225 Years of History & Mystery

   https://dukelawref.blogspot.com/2015/07/americas-first-patent-225-years-of.html

   Hopkins received the first U.S. patent, signed by President George Washington himself, for his method of manufacturing pot ash and pearl ash, (...)

4. The Goodson Blogson

   https://dukelawref.blogspot.com/2015/

   Hopkins received the first U.S. patent, signed by President George Washington himself, for his method of manufacturing pot ash and pearl ash, (...)