White lead

White lead

Chembox new
ImageFile =
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IUPACName =
OtherNames = basic lead carbonate
Section1 = Chembox Identifiers
CASNo = 1319-46-6
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = (PbCO3)2·Pb(OH)2
MolarMass = 775.633 g/mol
Appearance = white powder
Density =
MeltingPt =
BoilingPt =
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Section3 = Chembox Hazards
MainHazards = lead poisoning
FlashPt =
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White lead is the chemical compound (PbCO3)2·Pb(OH)2."Inorganic Chemistry",Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0123526515] It was formerly used as an ingredient for lead paint and a cosmetic called Venetian Ceruse, because its opaque quality made it a good pigment. However, it tended to cause lead poisoning, and its use has been banned in most countries.

White lead has been the principal white of classical European oil painting.cite web
title=Stack Process White Lead (Old Dutch Method)
url=http://naturalpigments.com/detail.asp?PRODUCT_ID=475-11S Commercial supplier, offering original pigments to the conservation and reproduction markets] It is partly responsible for darkening of old paintings over time, because it reacts with trace amounts of hydrogen sulfide in the air, producing black lead sulfide. White lead has since been supplanted in artistic use by titanium white, which is somewhat less opaque and brilliant, but does not blacken and is not toxic.

Historically, white lead was produced by the Dutch process. This involved casting metallic lead as thin buckles. These were corroded with acid in the presence of carbon dioxide. Next they were placed in pots with a little vinegar (containing acetic acid). These were stacked up and left for six to fourteen weeks, by which time the blue-grey lead had corroded to white lead. The pots were then taken to a separating table where scraping and pounding removed the white lead from the buckles. The powder was then dried and packed for shipment. [ [http://www.lead411.org/Templates/history/white_lead_pigment.htm Lead411.org] based on Warren, Christian. 'Toxic Purity: The progressive era origins of America’s lead paint poisoning epidemic'. "Business History Review". Winter 1999, Vol. 73(4)]

White lead occurs naturally as a mineral, in which context it is known as hydrocerussite

Other synonyms (as an art pigment)

from

ceruse, flake white, silver white, slate white, Berlin white, Cremnitz / Kremnitz white, Crems / Krems white, Nottingham white, Vienna white

References


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Look at other dictionaries:

  • White lead — Lead Lead (l[e^]d), n. [OE. led, leed, lead, AS. le[ a]d; akin to D. lood, MHG. l[=o]t, G. loth plummet, sounding lead, small weight, Sw. & Dan. lod. [root]123.] 1. (Chem.) One of the elements, a heavy, pliable, inelastic metal, having a bright,… …   The Collaborative International Dictionary of English

  • White lead — White White (hw[imac]t), a. [Compar. {Whiter} (hw[imac]t [ e]r); superl. {Whitest}.] [OE. whit, AS. hw[imac]t; akin to OFries. and OS. hw[=i]t, D. wit, G. weiss, OHG. w[=i]z, hw[=i]z, Icel. hv[=i]tr, Sw. hvit, Dan. hvid, Goth. hweits, Lith.… …   The Collaborative International Dictionary of English

  • white lead —    White lead, a whitish corrosion product of lead, was formerly used to provide opacity in paints, especially in house paints. The white pigment in a colored paint is often called the hiding pigment. In addition to preventing the sun s damaging… …   Glossary of Art Terms

  • white lead — n. 1. a poisonous, heavy, white powder, basic lead carbonate, 2PbCO3·Pb(OH) 2, used in paints, pottery glazes, etc. 2. any of several white pigments containing lead, as lead sulfate …   English World dictionary

  • white lead — white′ lead′ [[t]lɛd[/t]] n. 1) chem. a white heavy powder of basic lead carbonate, 2PbCO3∙Pb(OH)2, used as a pigment, in putty, and in ointments for burns 2) chem. putty made from white lead in oil • Etymology: 1400–50 …   From formal English to slang

  • white lead — n any of several white lead containing pigments esp a heavy poisonous basic carbonate of lead of variable composition used esp. formerly in paints …   Medical dictionary

  • white lead — noun Date: 15th century any of several white lead containing pigments; especially a heavy poisonous basic carbonate of lead marketed as a powder or as a paste in linseed oil and used especially formerly in paints …   New Collegiate Dictionary

  • white lead — lead carbonate …   Eponyms, nicknames, and geographical games

  • White Lead (Painting) Convention, 1921 — Infobox ILO convention code= C13 name= White Lead (Painting) Convention, 1921 adopt= November 19, 1921 force= August 31, 1923 classify= Toxic Substances and Agents subject= Occupational Safety and Health prev= Workmen s Compensation (Agriculture) …   Wikipedia

  • white lead — /led/ 1. a white, heavy powder, basic lead carbonate, 2PbCO3·Pb(OH)2, used as a pigment, in putty, and in medicinal ointments for burns. 2. the putty made from this substance in oil. [1400 50; late ME] * * *       any of several white pigments… …   Universalium

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