The Characterization of Cobalt Violet Pigments

  • Corbeil M
  • Charland J
  • Moffatt E
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Abstract

The study of several commercial paints and dry pigments, as well as paint samples removed from works of art, allowed the identification of magnesium cobalt arsenate, a pigment that has not previously been reported in the literature. This article focuses on the composition, characterization and occurrences of this pig- ment as well as other violet cobalt compounds used as artists' pigments, namely cobalt phosphate, cobalt phos- phate octahydrate, ammonium cobalt phosphate hydrate and lithium cobalt phosphate. Cobalt arsenate, a pigment frequently mentioned in the literature on artists' materials, has not yet been unambiguously identified. The introduction of these compounds as pigments is briefly discussed. Introduction

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Authors

  • Marie-Claude Corbeil

  • Jean-Pierre Charland

  • Elizabeth A. Moffatt

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