Colours & Colouring Foods

Vegetable Carbon

Vegetable Carbon, commonly identified as E153 or INS 153 in markets where authorised, is an insoluble black pigment produced from controlled botanical feedstock. It is used to create black, charcoal-grey and muted dark shades in permitted food applications. Industrial selection should consider botanical source, production process, food-grade purity, colour strength, jetness, undertone, particle size, dispersion quality, contaminant controls, physical stability and destination-market legality.

Request quotation Review technical details

Vegetable Carbon, carbon black and activated carbon

The word “carbon” is used for several technically different materials. Correct product identity is essential because materials can share a dark appearance or CAS reference while differing in source, process, purity, functionality and legal status.

Colour science and visual performance

Vegetable Carbon creates colour through absorption and scattering by finely divided pigment particles. The perceived shade depends on more than addition rate. Particle-size distribution, aggregate structure, dispersion quality, product opacity, surface gloss, sample thickness and illumination all influence the final appearance.

Particle size, agglomeration and dispersion

Primary pigment particles can associate into aggregates and larger agglomerates. Poorly dispersed agglomerates can appear as black specks, produce uneven shade, block fine nozzles or accelerate settling. Product qualification should therefore include both particle-size information and an application-relevant dispersion test.

Commercial product forms

Selection of the physical form should reflect the production equipment, food matrix, addition rate, dust-control needs and required dispersion speed.

Powder wetting and dispersion procedure

Vegetable Carbon powder has a strong tendency to remain on the liquid surface or form dry-centred agglomerates when added too quickly. A controlled dispersion procedure can improve colour yield and reduce visible specks.

1. Confirm that the selected grade is compatible with the water, oil or mixed phase.
2. Prepare a suitable liquid phase with enough agitation to create controlled circulation.
3. Add the powder gradually below the liquid surface or into the highest-shear zone.
4. Avoid charging the full quantity onto a stagnant liquid surface.
5. Allow sufficient wetting time before concluding that the colour strength is low.
6. Apply high-shear mixing, colloid milling or homogenisation only where compatible with the food.
7. Inspect the dispersion for specks, foam, wall deposition and settled material.
8. Standardise the procedure before comparing suppliers or production lots.

Dosage and pigment-solids normalisation

Powders and liquid dispersions should be compared on a dry-pigment basis. A liquid product may contain water, oil, stabilisers and other carriers, so equal product weights do not necessarily deliver equal colour.

Confectionery and decorative applications

Vegetable Carbon may be used, where authorised, in fondants, sugar pastes, confectionery coatings, gums, fillings and edible-decoration systems. High sugar concentration, low water availability and fat content can affect wetting and colour development.

Bakery applications

In bakery products, Vegetable Carbon may be incorporated into dough, batter, icing, cream, filling or surface decoration. Final colour can be affected by flour, eggs, cocoa, milk solids, browning reactions, baking temperature and moisture loss.

Dairy, frozen-dessert and plant-based systems

Milk proteins, fat droplets, air cells and white mineral solids can strongly scatter light and reduce the apparent depth of black. A Vegetable Carbon grade that appears jet black in water may appear grey in ice cream, cream filling or plant-based dessert.

• Evaluate colour after homogenisation, freezing and hardening.
• Check interaction with proteins, emulsifiers and stabilisers.
• Measure sediment or colour separation during melted-product testing.
• Assess the influence of overrun and air-cell structure.
• Review staining of inclusions, ripples and package surfaces.
• Conduct sensory assessment for possible carrier or adsorptive effects.

Beverage and low-viscosity applications

Vegetable Carbon does not dissolve in beverages. Without an adequate suspension system, particles may settle, float, deposit on bottle walls or form a visible ring at the liquid-air interface. Transparent packaging can make minor instability highly visible.

Sauces, pastes and savoury products

Higher-viscosity sauces and pastes can suspend Vegetable Carbon more effectively than beverages, but uniform wetting and colour distribution remain important. Salt, acid, starch, protein and oil can change pigment behaviour.

• Determine whether the colour should be added to the water or oil phase.
• Assess compatibility with modified starches, gums and emulsifiers.
• Measure viscosity before and after pigment addition.
• Inspect for streaking during filling and cooling.
• Evaluate oil separation and pigment migration.
• Confirm shade under retail lighting and after heat processing.

Snack coatings and dry seasoning systems

In dry blends, colour uniformity depends on particle-size compatibility, powder flow and adhesion to the food surface. Very fine Vegetable Carbon may segregate from salt, sugar, starch or flavour particles during transport and vibration.

Extrusion and thermal processing

Vegetable Carbon is generally chemically stable under normal extrusion, baking and cooking conditions, but the final appearance can change as starch expands, proteins denature, moisture is removed and product density changes.

• Expansion can dilute apparent colour and create a lighter grey shade.
• High porosity increases light scattering and can reduce jetness.
• Dense products may appear darker at the same pigment concentration.
• Surface oil and seasoning can intensify or modify the final shade.
• Mechanical shear can improve dispersion but may affect other ingredients.
• Measure colour after the product reaches final moisture and temperature.

Interactions with flavours, colours and functional ingredients

Carbonaceous pigments can have substantial surface area and may adsorb selected flavour compounds, emulsifiers, colour molecules or other formulation components. The practical effect depends on grade, dosage, surface chemistry and food composition.

Specification and quality-control parameters

The approved purchasing specification should combine identity, colour performance, physical properties, purity and microbiological criteria. Exact limits must be agreed with the supplier and aligned with destination-market requirements.

Polycyclic aromatic hydrocarbon control

Polycyclic aromatic hydrocarbons can be generated during incomplete or uncontrolled thermal processing of organic material. Food-grade production should therefore use validated carbonisation and purification controls supported by appropriate analytical testing.

• Request the applicable PAH specification and test method.
• Confirm whether benzo[a]pyrene and a broader PAH group are monitored.
• Review the laboratory detection and quantification limits.
• Confirm whether testing is performed per lot or through a justified monitoring plan.
• Assess raw-material and process changes through formal change control.
• Do not accept fuel-grade or technical-grade contaminant data as evidence of food compliance.

Microbiological and hygiene controls

Although Vegetable Carbon is not a nutrient-rich ingredient, food-grade powder can acquire contamination from raw-material handling, milling, air, equipment, packaging or warehouse conditions. Microbiological criteria should reflect the intended food and customer risk assessment.

• Total aerobic plate count
• Yeast and mould
• Coliforms or Enterobacteriaceae where specified
• Escherichia coli
• Salmonella absence in the defined sample quantity
• Additional organisms for infant, dairy or high-care applications where relevant
• Environmental and packaging hygiene controls at the production site

Analytical-control strategy

Supplier and buyer methods should be aligned before commercial approval. Different dispersion procedures, sample thicknesses and instruments can produce materially different colour results from the same lot.

Method-alignment requirements

• Define sample preparation and pigment concentration.
• Define the white or neutral reference matrix.
• Define mixing equipment, speed, time and temperature.
• Define sample thickness, background and surface finish.
• Define instrument geometry, illuminant and observer angle.
• Use the same dry-basis or as-is basis when comparing products.
• Retain representative reference and complaint samples.

Supplier equivalency and substitution

Two Vegetable Carbon products can comply with a similar compositional specification yet produce different colour and processing results. Supplier substitution should be managed as a controlled formulation and process change.

Cost-in-use evaluation

Purchasing decisions should account for colour yield, active pigment concentration, process time and production losses. A higher-priced grade may have a lower cost in use if it provides greater tint strength, faster dispersion or fewer rejected batches.

A complete cost assessment may also include:

• Dry-pigment concentration and carrier contribution
• Dispersion and mixing time
• Dust extraction and occupational-control costs
• Yield loss in bags, transfer lines and mixing vessels
• Filter or nozzle blockage
• Production cleaning and colour-changeover time
• Off-shade batches and customer complaints
• Packaging staining or migration losses

Powder handling and occupational controls

Vegetable Carbon is a fine black powder that can generate visible airborne dust, contaminate surfaces and accumulate static charge. Handling controls should follow the supplier safety data sheet and the site's occupational and combustible-dust risk assessment.

Equipment design and cleaning

Black pigment can make minor residues highly visible and can contaminate subsequent light-coloured production. Equipment and scheduling should therefore support effective containment and clean-down.

• Use smooth, accessible equipment surfaces with minimal dead zones.
• Inspect gaskets, flexible hoses, filters and seals for retained pigment.
• Validate dry and wet cleaning procedures separately.
• Schedule black products before darker products where practical.
• Establish visual and analytical line-clearance criteria.
• Control rework so colour carryover remains known and authorised.
• Assess wastewater and filter-disposal requirements.

Packaging options

Packaging should protect Vegetable Carbon from moisture, contamination, package rupture and uncontrolled dust release. Liquid dispersions also require protection from freezing, separation and microbiological deterioration.

Packaging information to confirm

• Net weight and weight tolerance
• Primary food-contact material
• Bag or container closure method
• Lot code, production date and expiry date
• Pallet type, dimensions, wrapping and stacking pattern
• Maximum stack height and container-loading quantity
• Disposal and recycling information where required

Storage and shelf-life management

Vegetable Carbon should be stored in sealed original packaging in a cool, dry, clean and well-ventilated area, protected from moisture, direct sunlight, contamination and strong odours. Exact conditions must follow the approved supplier specification.

• Keep powder containers closed until use.
• Reseal partial packages immediately.
• Protect liquid dispersions from freezing and excessive heat.
• Store away from volatile chemicals and strongly aromatic materials.
• Apply first-expired, first-out inventory control.
• Inspect for caking, package damage, separation or microbial deterioration.
• Rehomogenise liquid grades only according to supplier instructions.
• Do not extend shelf life without an approved technical assessment.

Source, sustainability and chain of custody

The term “vegetable” indicates botanical origin but does not by itself establish sustainable sourcing. Buyers may require additional evidence concerning feedstock legality, forestry practices, land use and chain of custody.

Allergen, GMO and certification review

Pure Vegetable Carbon is not normally selected as a protein-containing ingredient, but commercial dispersions and formulated grades can contain carriers, emulsifiers or stabilisers that affect allergen and labelling status.

• Request an allergen statement covering the complete commercial product.
• Confirm cross-contact controls at the production and packing sites.
• Request GMO status for botanical carriers and processing aids.
• Confirm gluten status where starch or cereal-derived carriers are present.
• Review halal and kosher certification where required.
• Request vegan or animal-origin declarations for all formulated components.
• Confirm irradiation status and the use of nanomaterial terminology where relevant to local rules.

Regulatory and labelling review

Vegetable Carbon is not authorised for the same foods in every country. Permission may depend on the food category, maximum use conditions, technological need, consumer group and complete product composition.

• Confirm legal status before formulation, sampling, import or sale.
• Review both the pigment and every carrier, dispersant and processing aid.
• Confirm the permitted ingredient name and additive declaration.
• Do not rely on the CAS number as evidence of legal food use.
• Review restrictions for infant foods, medical foods and foods for special groups.
• Confirm whether maximum levels or quantum-satis principles apply.
• Verify rules for imported products even when manufacturing occurs elsewhere.
• Maintain written market-specific approval in the product-development file.

Colouring-food, natural and clean-label claims

Botanical source does not automatically make Vegetable Carbon a “colouring food,” natural colour, organic ingredient or clean-label colour. In many markets, E153 is regulated as a food additive colour.

• Do not replace the required additive declaration with an unsupported marketing term.
• Confirm whether the word “natural” has a defined or enforced local meaning.
• Review whether carbonisation is compatible with a customer’s colouring-food policy.
• Confirm organic-program compatibility with the relevant certification body.
• Ensure front-of-pack colour claims match the legal ingredient declaration.
• Keep supplier process descriptions and regulatory opinions on file.

Traceability and supplier qualification

Supplier approval should cover botanical source, carbonisation site, purification process, analytical capability, food-safety controls and formal change notification.

Documents to request before approval

Information required for an accurate quotation

A technically complete enquiry allows suppliers to propose a suitable grade and prevents comparison of non-equivalent products. Provide the following information whenever available:

• Finished-food application and product description
• Destination country and all intended export markets
• Required powder, granule, aqueous dispersion or oil-dispersion form
• Target black shade, undertone and opacity
• Reference product, approved colour standard or L*a*b* target
• Expected addition level and batch size
• Water, fat, protein and solids content of the food matrix
• Mixing, homogenisation, extrusion, baking or heat-process conditions
• Required particle size or dispersion performance
• PAH, heavy-metal and microbiological limits
• Botanical source and sustainability requirements
• Carrier, allergen, gluten and GMO restrictions
• Halal, kosher, vegan or organic requirements
• Annual demand, trial quantity and individual order quantity
• Preferred pack size and pallet configuration
• Delivery location, requested Incoterm and required shipment date
• Required technical, quality and regulatory documents
• Existing specification, certificate of analysis or benchmark sample