earth pigments

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  INFRA-ART spectral data collections: earth pigments

  by Ioana Maria Cortea — Published on September 2, 2025 — Reading time: 20 min Part of the INFRA-ART Spectral Data Collections article series Earth pigments are among the oldest materials used in human artistic expression. These naturally occurring pigments, derived from iron oxides, manganese compounds, clays, and other minerals, have been used since the earliest read more