The samples were submitted to the Conseil de Commerce in Paris by "D.L.F.," probably Guillaume-Louis de la Follie. They notes refer to test of the colors using potash (an alkali), acid, and soap. Source: From [M. de Montigny], Rapport du commerce d'un écrit intitulé 'Avis utile pour le commerce par Mr D.L.F.' qui m'a été communiqué par Mr de Montaran en janvier 1778, 22 January 1778, AN F/12/2259.
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