TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

CHROME ALUM [7 records]

Record 1 2011-08-29

English

Subject field(s)
  • Chemical Elements and Compounds
Universal entry(ies)
K2Cr2O7
formula, see observation
7778-50-9
CAS number
DEF

A chemical compound in the form of bright yellowish red transparent crystals, has a bitter metallic taste.

OBS

Utilization : Oxidizing agent(chemicals, dyes, intermediates), analytical reagent, brass pickling compositions, electroplating, pyrotechnics, explosives, safety matches, textiles, dyeing and printing, chrome glues and adhesives, chrome tanning leather, wood stains, poison fly paper, process engraving and lithography, synthetic perfumes, chrome alum manufacture, pigments, alloys, ceramic products, depolarizer in dry cell batteries, bleaching fats and waxes.

OBS

Chemical formula: K2Cr2O7

French

Domaine(s)
  • Éléments et composés chimiques
Entrée(s) universelle(s)
K2Cr2O7
formula, see observation
7778-50-9
CAS number
OBS

Formule chimique : K2Cr2O7

Spanish

Campo(s) temático(s)
  • Elementos y compuestos químicos
Entrada(s) universal(es)
K2Cr2O7
formula, see observation
7778-50-9
CAS number
OBS

Fórmula química: K2Cr2O7

Save record 1

Record 2 2011-01-31

English

Subject field(s)
  • Chemical Elements and Compounds
  • Leather Industry
  • Ceramics (Industries)
  • Inks and Colour Reproduction (Graphic Arts)
Universal entry(ies)
CrNH4(SO4)2·12H2O
formula, see observation
CrH4NO8S2
formula, see observation
Cr2(SO4)3,(NH4)2 SO4, 24H2O
formula, see observation
OBS

Properties: Green powder or deep violet crystals ... The aqueous solution is violet when cold, green when hot. ... Use: Mordant, tanning.

OBS

Chemical formula: CrNH4(SO4)2·12H2O or CrH4NO8S2 or Cr2(SO4)3,(NH4)2 SO4, 24H2O

French

Domaine(s)
  • Éléments et composés chimiques
  • Industrie du cuir
  • Céramique (Industries)
  • Encres et couleurs (Industrie graphique)
Entrée(s) universelle(s)
CrNH4(SO4)2·12H2O
formula, see observation
CrH4NO8S2
formula, see observation
Cr2(SO4)3,(NH4)2 SO4, 24H2O
formula, see observation
OBS

Cristaux bleu violet [...], soluble dans l'eau, les acides dilués, l'alcool. Utilisation : Tannerie, encres, céramique.

OBS

Formule chimique : CrNH4(SO4)2·12H2O ou CrH4NO8S2 ou Cr2(SO4)3,(NH4)2 SO4, 24H2O

Key term(s)
  • sulfate double d'ammonium et de chrome
  • alun de chrome et d'ammonium

Spanish

Save record 2

Record 3 2001-01-08

English

Subject field(s)
  • Chemical Elements and Compounds
  • Water Treatment (Water Supply)
DEF

Any of a series of double salts isomorphous with potash alum that may contain analogous elements in place of the potassium, aluminum, and sulfur [Ex. :] soda alum, chrome alum, selemium alum.

CONT

Wastewater treatment systems with facultative ponds use mostly alum or ferric chloride as coagulants to meet phosphorus removal standards.

OBS

"Alum" is also a synonym of "potassium alum", "ammonium alum", and "aluminum sulfate". See those records.

French

Domaine(s)
  • Éléments et composés chimiques
  • Traitement des eaux
DEF

Nom générique des sulfates doubles de formule générale M2SO4. M2(SO4)3. 24H2O, où M représente un métal alcalin ou l'ammonium, et [le second]M un métal trivalent : aluminium, fer ou chrome. [...] L'alun est le type d'une série de sulfates doubles hydratés, de composition analogues, de même forme cristalline et isomorphes.

Spanish

Save record 3

Record 4 1999-02-25

English

Subject field(s)
  • Photography
DEF

Chemical(typically potash alum, chrome alum or formalin) used to toughen the gelatin emulsion of sensitised materials to render it less liable to softening or even melting in warm processing solutions as well as more resistant to physical damage by scratching or rubbing when dried.

OBS

hardener: term standardized by the National Micrographics Association (U.S.).

Key term(s)
  • hardening agent

French

Domaine(s)
  • Photographie
DEF

Produit chimique ajouté dans le bain de fixage pour durcir les émulsions gélatineuses (film et papier) les rendant ainsi moins sujettes aux égratignures.

Key term(s)
  • tannant
  • agent de tannage

Spanish

Save record 4

Record 5 1975-03-11

English

Subject field(s)
  • Photography
  • General Scientific and Technical Vocabulary
OBS

chrome alum(...) violet crystals forming a purplish solution. When heated, or in presence of sulphite, the solution gradually turns greenish and loses its hardening properties.

Key term(s)
  • hardening property

French

Domaine(s)
  • Photographie
  • Vocabulaire technique et scientifique général
OBS

l'alun de chrome (...) Cristaux violets, assez solubles dans l'eau tiède. La dissolution à une température dépassant 50 degrés diminue fortement le pouvoir durcisseur de cet alun.

Spanish

Save record 5

Record 6 1975-03-11

English

Subject field(s)
  • Photography
OBS

(...) a--containing chrome alum is used prior to fixing, especially in hot weather.

French

Domaine(s)
  • Photographie
OBS

(...) on emploie souvent, au lieu d'un rinçage à l'eau pure, un -- [qui contient] de l'eau et un produit tannant, l'alun de chrome.

Spanish

Save record 6

Record 7 1975-03-11

English

Subject field(s)
  • Photography
CONT

Chrome alum. Characteristics : violet crystals forming a purplish solution. When heated, or in the presence of sulphite, the solution gradually turns greenish and loses its hardening properties.

French

Domaine(s)
  • Photographie
CONT

l'alun (sulfate double de chrome et de potassium) [...] La dissolution à une température dépassant 50 degrés diminue fortement le pouvoir durcisseur de cet alun.

Spanish

Save record 7

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