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Lead(II) chromate can be produced by treating sodium chromate with lead salts such as lead(II) nitrate or by combining lead(II) oxide with chromic acid.. Related lead sulfochromate pigments are produced by the replacement of some chromate by sulfate, resulting in a mixed lead-chromate-sulfate compositions Pb(CrO 4) 1−x (SO 4) x.
Phoenicochroite is a basic lead chromate, Pb 2 CrO 5 with dark red crystals, and vauquelinite a lead and copper phosphate-chromate, Pb 2 CuCrO 4 PO 4 OH, with brown or green monoclinic crystals. Vauquelinite was named after Louis Nicolas Vauquelin , who in 1797 discovered (simultaneously with and independently of M. H. Klaproth) the element ...
Chrome yellow or crocoite (PY34): lead chromate (PbCrO 4). Cobalt pigments. Aureolin or cobalt yellow (PY40): potassium cobaltinitrite (K 3 Co(NO 2) 6). Iron pigments. Yellow ochre (PY43): a naturally occurring clay of monohydrated ferric oxide (Fe 2 O 3 ·H 2 O). Lead pigments. Naples yellow (PY41). Lead-tin-yellow: PbSnO 4 or Pb(Sn,Si)O 3 ...
As of Dec. 29, the Centers for Disease Control and Prevention had received 287 confirmed, probable and suspected reports of elevated blood lead levels linked to the pouches across 37 states.
For example, lead chromate, a bright yellow pigment, is sometimes added to turmeric to boost its color. The FDA has found that imported spices, especially from countries with lax regulations, ...
Later the FDA confirmed the lead and chromium were from lead chromate — an inorganic compound that, historically, has been illegally added to certain spices to increase their weight and enhance ...
Nevertheless, a Canadian company, Dominion Colour Corporation, is "the largest manufacturer of lead-based paint pigments in the world" and has faced public criticism for obtaining permission from the European Chemicals Agency to continue to export lead chromate paints from its Dutch subsidiary to countries where its uses are not tightly regulated.
For example, compounds like red brick, red lead salt, lead oxide and lead chromate, which mirror cinnamon’s red color, have been added to increase the value of the spice, research shows.
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