See also PW24, Aluminum Hydroxide. PW23 appears to be Aluminum hydrate and Barium sulfate. Artiscreation cites the Colour Index 3rd ed., to clarify that this is "Aluminum hydrate, Barium sulfate; Coprecipitate of about. 25% aluminium hydroxide and 75% barium sulfate."
PW23 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
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