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[Footnote ee: Mr. Bonnardot says: "Taches des crayons. (Plombagine, sanguine, crayon noir, etc.) Les traces récentes que laissent sur le papier ces divers crayons s'effacent au contact du caoutchouc, ou de la mie de pain; mais, quand elles sont trop anciennes, elles résistent
The writer discovered this in the course of many amateur print- and book-cleaning experiments, and has since found his experience confirmed by the high authority of M. Bonnardot, in his "Essai sur l'Art de Restaurer les Estampes et les Livres." Our present concern is, however, only with the writing which is in the ordinary letter, and in pencil.
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