Yellow prussiate of soda

E number E535INS 535CAS 13601-19-9

Used as an anticaking agent.

Sodium ferrocyanide is the anticaking agent in most table salt. As with the potassium form, the cyanide is bound to iron in a stable complex rather than present as free cyanide.

Where it is and isn’t permitted

Status of Yellow prussiate of soda by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted, with conditions21 CFR 172.490retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFAPermitted, with conditions

3 food categories

highest permitted level 20 mg/kg

Show every food category
  • 12.1.1 Salt — 14 mg/kg
  • 12.1.2 Salt substitutes — 20 mg/kg
  • 12.2.2 Seasonings and condiments — 20 mg/kg
CXS 192-1995 Table One, INS 535and 2 further provisionsretrieved 2026-09-07

What it is made from

Manufactured from hydrogen cyanide, iron salts and sodium hydroxide. Its traditional name comes from Prussian blue, the pigment made from the same iron-cyanide chemistry.

  • Vegan
  • Vegetarian
CAS registry number
13601-19-9
InChIKey
GTSHREYGKSITGK-UHFFFAOYSA-N
PubChem
CID 26129

Every name it appears under

44 recorded names. A label may use any of them.

E number

  • E535

INS number

  • 535

CAS registry number

  • 13601-19-9

As it appears in regulation

  • Yellow prussiate of soda

Other names

  • 5HT6X21AID
  • ADDITION AGENT 55
  • E 535
  • Ferrate(4), hexacyano, tetrasodium
  • Ferrate(4), hexakis(cyanoC), tetrasodium, (OC611)
  • Ferrate(4-), hexacyano-, tetrasodium
  • Ferrate(4-), hexakis(cyano-.kappa.C)-, sodium (1:4), (OC-6-11)-
  • Ferrate(4-), hexakis(cyano-.kappa.C)-, tetrasodium, (OC-6-11)-
  • Ferrate(4-), hexakis(cyano-C)-, tetrasodium
  • Ferrate(4-), hexakis(cyano-C)-, tetrasodium, (OC-6-11)-
  • Ferrate(4-), hexakis(cyano-kappaC)-, sodium (1:4), (OC-6-11)-
  • Ferrate(4-), hexakis(cyano-kappaC)-, tetrasodium, (OC-6-11)-
  • FERROCYANIDES
  • HEXACYANOFERRATE OF SODIUM
  • HSDB 742
  • INS NO.535
  • INS-535
  • lambda2-iron(2+) ion tetrasodium hexakis(iminomethanide)
  • Natriumhexazyanoferrat(II)
  • Sodium ferrocyanide
  • Sodium ferrocyanide (Na4(Fe(CN)6))
  • Sodium ferrocyanide, AldrichCPR
  • sodium hexacyanidoferrate(4-)
  • sodium hexacyanidoferrate(II)
  • Sodium hexacyanoferate(II)
  • Sodium hexacyanoferrate
  • sodium hexacyanoferrate(4-)
  • Sodium hexacyanoferrate(II)
  • Sodium hexacyanoferrate(II) decahydrate, 99%
  • Sodium prussiate yellow
  • Tetrasodium ferrocyanide
  • tetrasodium hexacyanidoferrate
  • Tetrasodium hexacyanoferrate
  • Tetrasodium hexacyanoferrate(4)
  • Tetrasodium hexacyanoferrate(4-)
  • tetrasodium hexakis(cyanido-kappaC)ferrate(4-)
  • tetrasodium;iron(2+);hexacyanide
  • Yellow prussiate of soda
  • Yellow prussiate of sodaSodium hexacyanoferrate

Systematic names

  • tetrasodium;iron(2+);hexacyanide

Hazard reference values

Values set by assessing bodies. A body that has not set a value is not listed here.
TypeValuePopulationAssessed byOpinion
ADI0.03 mg/kg bw/dayconsumersEFSA ANS2018

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07
  • gsfa retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/yellow-prussiate-of-soda.json