The History of Italian Painting. Luigi Lanzi

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gained over Bottari to his opinion.[296] Inspection overturns this supposition, for we may discover the seams between the different colours; and this circumstance induces the author of the Sienese Letters and the best informed persons, to disbelieve the artificial colouring of the marble. The truth is, the secret of colouring marble was not then known, but was afterwards discovered in Siena by Michelangiolo Vanni, who has transmitted the memory of his invention to posterity.[297] He erected a monument for his father, Cav. Francesco, with columns, ornaments, festoons, and figures of children; accompanied by a genealogy of the family, which were all designed on a white slab, and every part carefully and appropriately coloured, so as to resemble mosaic of different marbles. It is supposed that the colours were imparted to the marble by some mineral essences to impregnate it, because they penetrated a considerable way. He entitles himself the inventor of this art, in the monumental inscription. A secret of this nature was known to Niccolò Tornioli, of Siena, about the year 1640; and this artist is said to have painted a Veronica in that manner, the marble of which he caused to be sawed, and the same picture was found on each side of the section.[298] He was probably a scholar of Vanni; and the latter seems anxious by the inscription that he should not claim the honour of the invention. The connexion of the subject has led me to notice these two artists in this place. Their true place is in the third epoch of the Sienese school, to which I shall immediately proceed.

      SIENESE

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