E535 SODIUM FERROCYANIDE

E535 Sodium ferrocyanide, also known as sodium hexacyanoferrate(II) (Na₄[Fe(CN)₆]), is an inorganic coordination salt used mainly as an anticaking agent in food-grade salt and salt substitutes, where it prevents clumping by inhibiting crystal growth and moisture-induced aggregation, allowing fine salt particles to remain free-flowing even under humid storage conditions.
E535 Sodium ferrocyanides chemical structure, it is a stable complex compound in which the cyanide groups are tightly bound to iron, which significantly reduces its reactivity under normal conditions.
E535 Sodium ferrocyanide improves salt flowability and storage stability in food and industrial applications.

CAS Number: 14434-22-1
Molecular Formula: C6H2FeN6NaO-3
Molecular Weight: 252.96
EINECS Number: 680-419-9

Synonyms: SODIUM FERROCYANIDE, 13601-19-9, sodium prussiate yellow, tetrasodium hexacyanoferrate, sodium hexacyanoferrate(II), tetrasodium ferrocyanide, sodium hexacyanoferrate(II), HSDB 742, tetrasodium hexacyanoferrate(4-), EINECS 237-081-9, ferrate(4-) hexacyano tetrasodium, sodium ferrocyanide Na4[Fe(CN)6], 5HT6X21AID, AI3-28762, DTXSID3051337, ferrate(4-) hexakis(cyano-C) tetrasodium, sodium hexacyanoferrate II, EC 237-081-9, ferrate(4-) hexakis(cyano-kappaC) tetrasodium, INS-535, E-535, hexacyanoferrate of sodium, sodium ferrocyanide FCC, sodium ferrocyanide HSDB, sodium ferrocyanide MI, yellow prussiate of soda, natriumhexazyanoferrat(II), UNII-5HT6X21AID, SCHEMBL249941, CHEBI:30061, AKOS015901398, NS00086175, SODIUM HEXACYANOFERRATE(II)-10-HYDRATE;SODIUM HEXACYANOFERRATE(II) DECAHYDRATE;YELLOW PRUSSIATE OF SODA DECAHYDRATE;SODIUM HEXACYANOFERRATE(II)-10-HYDRATE E XTRA PURE;Sodium ferrocyanide;Sodium hexacyanoferrate(II) decahydrate, synthesis grade;SodiuM ferrocyanide decahydrate >=99%;Tetrasodium hexacyanoferrate decahydrate

E535 Sodium ferrocyanide consists of a central iron(II) ion surrounded by six cyanide ligands forming a stable coordination complex, with sodium ions balancing the charge, and this structure makes it very different from free cyanide compounds because the cyanide is not easily released under neutral or mildly alkaline conditions.
Only under strongly acidic conditions can decomposition potentially occur.
E535 Sodium ferrocyanide improves chemical stability and controlled behavior in safe applications.

E535 Sodium ferrocyanide appears as a yellow crystalline powder or crystalline solid, is water-soluble, and remains stable in dry storage conditions, while also being resistant to oxidation and decomposition under normal food processing and environmental conditions.
Its stability is one of the reasons it is permitted as a food additive in regulated amounts.
E535 Sodium ferrocyanide improves handling safety and industrial usability.

E535 Sodium ferrocyanide functions primarily as an anticaking and anti-clumping agent, where it prevents salt particles from sticking together by interfering with crystal bonding and moisture absorption processes, especially in fine-grained salt products used in food processing and seasoning industries.
This makes it highly effective in humid environments where salt normally absorbs moisture.
E535 Sodium ferrocyanide improves product consistency and shelf stability.

E535 Sodium ferrocyanide is best described as a stable iron–cyanide coordination compound used in very small regulated amounts as an anticaking agent in salt products due to its ability to prevent crystal aggregation while remaining chemically stable under normal storage and food-use conditions.
E535 Sodium ferrocyanide is also used in advanced salt refining and purification systems, where it is added in extremely small, regulated concentrations during the final stages of salt processing to ensure long-term flow stability, especially for finely ground vacuum salt that would otherwise absorb moisture and form hard crusts during storage and transport.

E535 Sodium ferrocyanides effectiveness comes from interfering with crystal surface interactions rather than chemically reacting with the salt itself.
This improves industrial salt quality control and packaging stability.

In humidity-prone storage environments, it plays an important role because it helps salt remain free-flowing even when exposed to repeated humidity cycles, such as in coastal regions or tropical climates where salt naturally tends to absorb water vapor and form solid blocks over time.
E535 Sodium ferrocyanide makes it particularly important for global salt distribution networks.
E535 Sodium ferrocyanide improves shelf-life performance and storage reliability.

In electroplating and metal finishing industries, E535 Sodium ferrocyanide compounds are used as part of controlled electrolyte systems, where they can influence deposition behavior of certain metals like zinc and iron by forming stable complexes that modify ion availability and help produce smoother, more uniform coatings.
This role is strictly industrial and carefully controlled.
E535 Sodium ferrocyanide improves coating uniformity and electrochemical process control.

In pigment chemistry beyond Prussian blue, E535 Sodium ferrocyanide is part of intermediate reaction systems used to produce a range of iron-based pigments and coordination compounds, where its stable iron–cyanide framework acts as a structural source for color-forming reactions in controlled chemical manufacturing.
These processes rely on its predictable coordination chemistry rather than free cyanide chemistry.
E535 Sodium ferrocyanide improves pigment synthesis and industrial color production.

In analytical chemistry and laboratory standards, E535 Sodium ferrocyanide is used as a reference compound in coordination chemistry studies because its iron-centered complex provides a stable and well-understood structure for testing ligand exchange reactions, redox behavior, and metal complex formation under controlled conditions.
This makes it useful in teaching and research environments.
E535 Sodium ferrocyanide improves experimental reproducibility and chemical education.

Melting point: 82℃ · 10H₂O
Density: 1.458 g/cm3
RTECS: LJ8145000
Refractive index: 1.530
Flash point: 435°C
Storage temp.: Hygroscopic, -20°C freezer, under inert atmosphere
Solubility: Methanol (slightly), water (heated)
Form: powder
Color: light yellow
Specific Gravity: 1.458
Odor: odorless
Water Solubility: soluble
Decomposition: 435 ºC
Exposure limits:
ACGIH: TWA 1 mg/m3
NIOSH: IDLH 25 mg/m3; TWA 1 mg/m3
Stability: Stable. Incompatible with strong oxidizing agents.
InChI: 1S/6CN.Fe.4Na.10H2O/c61-2;;;;;;;;;;;;;;;/h;;;;;;;;;;;101H2/q;;;;;;-4;4*+1;;;;;;;;;;
InChIKey: KJSGVRTUMXJODL-UHFFFAOYSA-N
SMILES: O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[Na+].[Na+].N#CFe-4(C#N)(C#N)(C#N)C#N
LogP: -0.250 (est)

E535 Sodium ferrocyanide is widely used in table salt and industrial salt production, where it ensures that salt remains free-flowing during packaging, transportation, and storage, especially in humid climates where moisture would otherwise cause caking and hard clumping that reduces product quality and usability.
This makes it particularly important in large-scale food distribution systems.
E535 Sodium ferrocyanide improves salt handling and commercial packaging efficiency.

E535 Sodium ferrocyanide is used in small controlled amounts to keep road salt free-flowing during winter storage, allowing it to spread evenly when applied on roads to melt ice and snow more effectively under cold and wet conditions.
This helps maintain performance of salt-based de-icing systems.
E535 Sodium ferrocyanide improves winter road safety and salt performance consistency.

In industrial chemical processing, E535 Sodium ferrocyanide is used as a precursor in the production of pigments, such as Prussian blue, where controlled chemical reactions involving iron complexes are used to produce stable inorganic coloring agents for paints, inks, and coatings.
This highlights its role in coordination chemistry applications.
E535 Sodium ferrocyanide improves pigment production and industrial color chemistry.

E535 Sodium ferrocyanide compounds were used in cyanotype processes, where light-sensitive reactions produce blue-colored images, although modern applications are now more specialized and less common due to digital imaging technologies.
E535 Sodium ferrocyanide represents an important historical application in imaging science.
This improves understanding of photographic chemistry history.

E535 Sodium ferrocyanide is used as a reagent in qualitative analysis for detecting iron ions and studying coordination chemistry, because it forms characteristic colored complexes that help identify specific metal ions in solution.
Its predictable reactions make it useful in analytical chemistry.
E535 Sodium ferrocyanide improves chemical identification and experimental analysis.

In water and environmental chemistry studies, E535 Sodium ferrocyanide is sometimes used under controlled conditions to study complex ion stability, redox behavior, and coordination reactions, although its use is strictly regulated due to safety considerations in environmental discharge.
E535 Sodium ferrocyanide is mainly relevant in research and controlled industrial settings.

In corrosion inhibition research, E535 Sodium ferrocyanide systems are studied for their ability to influence metal surface chemistry, where they can contribute to the formation of protective layers or modify electrochemical behavior in certain environments, especially in controlled laboratory or industrial research contexts.
This is an area of applied materials science investigation.
E535 Sodium ferrocyanide improves corrosion science and material protection research.

In historical industrial photography and blueprint production, ferrocyanide compounds were used in cyanotype processes where UV light triggers reactions that produce deep blue images on treated paper or fabric, and although this is now mostly replaced by digital methods, it remains an important artistic and educational application.
E535 Sodium ferrocyanide represents one of the classic uses of coordination chemistry in imaging.
This improves historical understanding of photographic chemistry.

In environmental chemistry monitoring, E535 Sodium ferrocyanide is studied as part of risk assessment models for cyanide-containing coordination compounds, helping scientists understand how stable complexes behave in soil and water systems, particularly under varying pH and oxidation conditions.
These studies ensure safe industrial and environmental handling practices.
E535 Sodium ferrocyanide improves environmental safety assessment and chemical risk analysis.

In food industry quality assurance systems, its presence is carefully monitored rather than actively increased, meaning analytical methods are used to ensure correct dosing levels in salt products and compliance with strict regulatory limits across different countries and food safety agencies.
This is an important part of modern food safety regulation.
E535 Sodium ferrocyanide improves regulatory compliance and consumer safety assurance.

E535 Sodium ferrocyanide is sometimes compared with other anticaking agents to evaluate performance differences in salt flowability, moisture resistance, and long-term stability, helping manufacturers choose optimal additive systems depending on climate and packaging conditions.
This supports product development and optimization.

This improves formulation efficiency and product design.
E535 Sodium ferrocyanide is a highly stable coordination compound primarily used in regulated anticaking systems for salt, with additional roles in pigment production, electrochemistry, analytical chemistry, and industrial research because of its unique iron–cyanide complex structure, which provides stability, moisture resistance, and predictable chemical behavior under normal conditions while remaining tightly controlled for safety reasons.

Uses Of E535 Sodium ferrocyanide:
E535 Sodium ferrocyanide is being used and studied as a possible cathode material for sodium ion batteries.
E535 Sodium ferrocyanide is mainly used as an anticaking agent, flow improver, and industrial coordination compound because of its ability to prevent crystal aggregation and maintain free-flowing powder properties in salt-based products.

In table salt production, E535 Sodium ferrocyanide is used to prevent clumping and maintain free-flowing salt under humid conditions.
This improves product quality and usability.
In food-grade salt substitutes, it is used in very small regulated amounts to maintain powder stability.

E535 Sodium ferrocyanide improves storage stability and consumer convenience.
In de-icing salt, it is used to keep road salt dry and easy to spread during winter conditions.
E535 Sodium ferrocyanide improves winter road safety and application efficiency.

In pigment and dye manufacturing, it is used as a precursor for iron-based pigments such as Prussian blue.
E535 Sodium ferrocyanide improves industrial pigment production.
In laboratory chemistry, it is used as a reagent in coordination chemistry and metal ion testing.

E535 Sodium ferrocyanide improves analytical accuracy and chemical research.
In industrial chemical processing, it is used in controlled reactions involving iron coordination compounds.
E535 Sodium ferrocyanide improves chemical synthesis and material development.

E535 Sodium ferrocyanide is mainly used as a food-approved anticaking agent and industrial flow-control additive because it prevents fine salt particles from sticking together by inhibiting crystal bridging and moisture-induced clumping, ensuring that salt remains free-flowing during storage, transport, and consumer use.
In table salt production, it is added in very small regulated amounts to prevent caking and maintain smooth pouring and consistent texture in fine salt products.
E535 Sodium ferrocyanide improves usability and product quality.

E535 Sodium ferrocyanide is used to maintain powder stability in humid conditions where salt would otherwise absorb moisture and harden.
This improves storage stability and consumer convenience.
In industrial salt processing, it helps maintain flowability during large-scale packaging and bulk handling operations.

E535 Sodium ferrocyanide improves manufacturing efficiency and material handling.
In de-icing salt formulations, it is used to keep road salt free-flowing during winter storage and distribution so it can be spread evenly on roads.
This improves winter road safety and application performance.

In pigment manufacturing, it is used as a precursor in the production of iron-based pigments such as Prussian blue.
E535 Sodium ferrocyanide improves industrial pigment synthesis.
E535 Sodium ferrocyanide is used as a reagent in coordination chemistry and metal ion analysis.

E535 Sodium ferrocyanide improves analytical testing and chemical research.
In industrial chemical studies, it is used in controlled reactions involving iron complexes and coordination compounds.
E535 Sodium ferrocyanide improves chemical process understanding and development.

Safety Profile Of E535 Sodium ferrocyanide:
E535 Sodium ferrocyanide is considered a low-to-moderate hazard substance under normal regulated use, because the ferrocyanide complex is stable and does not readily release free cyanide ions in neutral or mildly alkaline conditions, which are typical for food-grade applications.
However, safety concerns mainly arise under improper chemical conditions rather than normal usage.
E535 Sodium ferrocyanide requires controlled handling and regulatory compliance.

The main chemical risk occurs under strongly acidic conditions, where the compound can potentially decompose and release small amounts of hydrogen cyanide gas, which is highly toxic; however, this scenario is not expected in normal food or storage environments due to strict pH control and regulatory limits.
E535 Sodium ferrocyanide makes acidity control a key safety factor.

Inhalation of dust may cause mild respiratory irritation, especially in industrial settings where fine particles may become airborne during handling or mixing.
This is generally an occupational exposure concern.
E535 Sodium ferrocyanide requires standard dust control measures.

Skin and eye contact may cause mild irritation, although it is not strongly corrosive or caustic under normal exposure conditions.
Rinsing with water is usually sufficient in case of accidental contact.
E535 Sodium ferrocyanide makes it relatively low irritation risk compared to strong alkalis.

E535 Sodium ferrocyanide is not considered highly flammable or reactive under normal storage conditions, and it is generally stable in dry environments, but it must still be stored away from strong acids to prevent decomposition risk.
E535 Sodium ferrocyanide improves safe storage practices.
From an environmental perspective, it should not be released in large quantities, as cyanide-containing complexes can still pose ecological risks under certain degradation conditions, even though ferrocyanides are significantly less toxic than free cyanide compounds.