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Cadmium Red, bright red in shades from orange/red to maroon, was made at the turn of the 20th century. By the 1930's, lightfast, permanent with considerably lower toxicity, Cadmium Red had replaced Vermillion on artists' palettes. Gamblin chemically pure Cadmium reds contain less than 6 parts per million (PPM) of bio available cadmium metal. They do not require Federal health warning labels but are labeled for CA state Prop 65. Gamblin Artists' Oil Color, Cadmium Red Medium is made to be darker than Cadmium Red Light by longer exposure to heat and the addition of sulfo-selenide. Useful medium red with strong opaque masstone and muted tint. Pigment: Concentrated cadmium sulfo-selenide (PR 108), Vehicle: Alkali refined linseed oil, Lightfastness I, Series 5, Opaque
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