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In Field's Practical Treatise of 1795
Purple Ocher is manufactured from iron oxide earth deposits containing augite porphyry from the Lori province of Armenia
Pigment classification: Cadmium seleno sulphide
Chemical Description: Indanthrone
Sartorio red (PR101/102) - Excellent lightfastness
Raw Sienna gamblin-grounds In Field's Practical Treatise ofNatural Iron Oxide is the basis for this single pigment color, named after the region in Italy where it was first mined. Raw Sienna retains more of its yellowish color because is created prior to the heating process that creates "burnt" sienna. (Series 1) Pigment Classification: Inorganic Color Index Name: PY43 Color Index Number: 77492 Chemical Description: Natural Hydrated Iron Oxide Opacity Transparency: Semi Transparent Lightfastness Rating: 1
