Alice Macdonald, GB189311972A
An Improvement in the Manufacture of Sulphate of Lead Pigment.
Image credit: Macdonald, A. (1893)
On July 17, 1894, Alice Macdonald of Notting Hill, London, patented a method for producing sulphate of lead pigment without the need for washing. Her process involved filter pressing the fumes into a paste (or using them dry), then heating the material in air to burn off or oxidize impurities, resulting in a dense, white pigment.
Date of Application: 17 June 1893
Date of Issuance: 17 July 1894
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.