Sensient Colors UK Ltd

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Sensient Colors UK Ltd offers a comprehensive range of high quality synthetic and naturally derived dyes, lakes and pigments, to meet every requirement.

Products are available in a range of physical forms, supported by full documentation and technical expertise.

Physical Forms

Dyes: Powder

Colorants that express their full potential when dissolved in water, supplied in powder form.

Dyes: Granules

Water soluble dyes in granular form, providing ease of handling due to their good flow characteristics and reduced dusting.

Lakes

Insoluble colours produced by adsorbing the water soluble dye onto an insoluble polyvalent metal substrate.

Pigments

Insoluble colours that give the best

Packaging

Powders

Available in either cardboard or plastic containers with inner liners. Standard pack sizes, dependant on product, 1Kg, 5Kg, 10Kg.

Liquids

Available in food grade jerricans, lidded buckets and IBC’s. Standard pack sizes, dependant on product, 5Kg, 20Kg, 1000Kg.

Bespoke sachet packing also available upon request.

Oil Soluble

Colorants that express their full potential when dissolved in oil, supplied in powder form.

Liquids

Custom-made systems consisting of suitable colorants either dispersed or dissolved in a choice of medium, offering ease of handling and incorporation into the product.

Blends

Custom-made powder systems consisting of suitable colorants blended together, offering ease of handling and incorporation into the product.

Quality Control

Quality is intrinsic to all Sensient products. We aim to deliver total customer confidence and satisfaction through a range of products manufactured to the highest specifications and subjected to rigorous quality control testing before being released for sale.

All Sensient products are manufactured in dedicated production facilities approved by many major manufacturers, Sensient Colors UK Ltd is ISO 9001:2000 and the current BRC Global Standard accredited.

**Dishwash**

Sensient offers a variety of colours to meet the ever changing market requirements of the dishwash industry, from evolving colour trends in hand dishwash liquids through to multi-functional products for automatic dishwashers.

Colouring Liquid / Gel Products

Typically water soluble dyes are used to enhance the product appearance of liquid formulations used for dishwash. However, pigments could also be used depending on the viscosity of the formulation and the opacity requirements.

Typical dosage rates - 0.005% - 0.01%

Colouring Powdered Products

Typically pigments are used to colour powdered dishwash products. Speckles are widely used to enhance product appearance, with the colour either sprayed or tumbled onto a base, typically sodium carbonate.

Dosage rates are dependant on processing conditions.

Bespoke Products

The colours recommended overleaf are by no means a definitive list. We offer bespoke blends in varying formats, including powders, granules and solutions, along with a range of packaging options to suit your requirements.

Technical Considerations

Liquid dishwash products typically have a pH range of 7 – 9 and when selecting colours for use in this format, the factors to be considered include colour solubility and stability. Water soluble dyes each have different solubility levels and it is important not to exceed them to prevent precipitation and settling.

Some colours can be affected by certain ingredients, such as fragrances, which can cause a reaction resulting in fading and inconsistency of the colour. The inherent complexity of a fragrance means that the stability of each colour needs to be carefully tested in each case. When suspending insoluble lakes/pigments in liquid products, the iscosity of the system needs to be considered to prevent settling of the colour.

When colouring powdered dishwash products, pigments/ lakes generally have better light stability than dyes. However, when using these types of colour, consideration should be given to possible residues. Reactions in the dishwasher could leave aluminium silicate on glassware, and phthalocyanine pigments could cause staining to the inside of dishwashers.

We are always here to assist you with your colour development needs. Our technical staff can offer you: technical support, application advice and a colour sampling service. Feel free to contact us at any time for practical working solutions to any of your colour problems.

**Film Coating with Iron Oxides**

Iron oxides are synthetically produced water insoluble pigments available in yellow, red and black. Other shades, commonly browns, can be achieved using combinations of these colours.

Benefits

Iron oxides have exceptional batch to batch colour consistency, chemical resistance, durability and stability. They are also amongst the most globally accepted forms of colour and are permitted by most regulatory bodies governing the use of colours in medicines and food supplements.

Legislation

Sensient Pharmaceutical Technologies can provide tablet coating systems incorporating iron oxides conforming to the purity requirements of the following legislation:

95/45/EC Specific Purity Criteria Concerning Colours for use in Foodstuffs 21, US Code of Federal Regulations National Formulary FAO/WHO Joint Expert Committee on Food Additives Japanese Pharmaceutical Excipients.

**Toiletries/Personal care**

Sensient offers a variety of colours for personal care applications, including hair care (shampoos, conditioners, styling products), skin care (soap, body wash, creams) and oral care (toothpaste, mouthwash, denture fixatives and denture cleaners).

Dyes

Dyes colour when dissolved in a solvent. They selectively absorb certain wavelengths of light, which allows the balance of the light to be transmitted without scattering, so they appear transparent. Remember that dyes always make the product appear darker as they reduce the amount of light that reaches the eye.

Lakes and Pigments

Lakes and pigments colour by dispersion, selectively absorbing some wavelengths of light and reflecting others. Pigments can lighten or darken the product being coloured, depending on the original hue.

Bespoke Products

The colours recommended overleaf are by no means a definitive list. We offer bespoke blends in varying formats, including powders, granules and solutions, along with a range of packaging options to suit your requirements. All dyes and pigments can be offered as solutions or dispersions in a variety of carriers. We also offer novel product ideas such as our Masterflecks™ and Sensipearl™ pearlescent ranges.

Technical Considerations

There are many different types of personal care products available in a variety of formats, including liquids, gels, solids and powders in both opaque and transparent forms.

Personal Care products typically have a neutral pH of 4.5 – 7.5. There are several factors that should be considered when including colour in the formula. These include colour solubility and colour stability.

Water soluble dyes each have different solubility levels and it is important not to exceed them to prevent precipitation and settling in liquid products.

Some colours can be affected by certain ingredients such as fragrances, which can cause a reaction resulting in fading and inconsistency of the colour. The inherent complexity of a fragrance means that the stability of each colour needs to be carefully tested in each case.

All the colours offered by Sensient Colors UK for these applications are manufactured to applicable current legislation: Europe: EU Directive 76/768/EEC;

USA: CFR Pts 73, 74 & 82.

We are always here to assist you with your colour development needs. Our technical staff can offer you technical support, application advice and a colour sampling service. Feel free to contact us at any time for practical working solutions to any of your colour problems.

**Laundry**

Sensient offers a variety of colours to meet the market requirements of the laundry industry, including the considerations of washing performance, cost, efficiency and increasingly, environmental impact.

Colouring Liquid Detergent

Typically water soluble dyes are used to enhance product appearance and brand recognition of liquid formulations used for laundry detergents. However, pigments could also be used depending on the viscosity of the formulation and the opacity requirements.

Typical dosage rate - 0.005% - 0.01%

Colouring Powdered Detergent

Typically pigments are used to enhance the appearance of the powder and are sprayed onto it to create a speckled effect. Water soluble dyes could also be used if the powder contains some moisture.

Dosage rates depend on processing conditions.

Colouring Fabric Conditioner

Typically fabric conditioners use cationic surfactants and are opaque systems. Water soluble dyes are generally used.

Typical dosage rate - 0.005% - 0.01%

Bespoke Products

The colours recommended overleaf are by no means a definitive list. We offer bespoke blends in varying formats, including powders, granules and solutions, along with a range of packaging options to suit your requirements.

Technical Considerations

Laundry liquids typically have a pH range of 7 – 9 and can either be opaque or transparent. When selecting colours for use in this format, factors to be considered include colour solubility, colour stability and staining.

Water soluble dyes each have different solubility levels and it is important not to exceed them to prevent precipitation and settling. Some colours can be affected by certain ingredients, such as fragrances, which can cause a reaction resulting in fading and inconsistency of colour.

The inherent complexity of a fragrance means that the stability of each colour needs to be carefully tested in each case. There is a potential to stain laundry if the amount of colour in the formula is too high.

When suspending insoluble lakes/pigments in liquid products the viscosity of the system will be a consideration in preventing the colour from settling. Insoluble lakes/ pigments can be suspended in liquid products if the viscosity is sufficient to prevent settling.

For colouring powdered products, lakes/pigments generally have a better light stability than dyes. When using water soluble dyes in powder formulations, migration should be considered. If a speckled effect is desired and there is moisture within the product, water soluble dyes may migrate.

Blue or violet colours can enhance brightness of powders by assisting the optical brightener in the formulation. We are always here to assist you with your colour development needs. Our technical staff can offer you technical support, application advice and a colour sampling service. Feel free to contact us at any time for practical working solutions for any of your colour problems.

Regulatory Information

Sensient Colors offers a range of products to suit different regulatory requirements.

European Grades

European legislation on colours permitted in medicines is quite old and can be found in Directive 78/25/EEC.

In principle it allows colours permitted in foods to be used in medicines.

The food colour legislation was updated with Directive 94/36/EC and the new permitted list can be found in Annex 1. This food legislation also covers food supplements, where there is a list of permitted colours and maximum dosages.

Purity criteria were also established for all the colours and these are set out in Directive 95/45/EC, which specifies the identity, assay and sets limits for impurities.

USA

The USA has a different list of permitted colours contained within the Code of Federal Regulations (21 CFR); many of the colours are the same as used in Europe but with different names.

The list is split into colours that are exempt from, and those requiring, certification. In order to become “certified” a sample of the colour must be sent to the Food and Drug Administration, where it is tested and a certificate and FDA lot number are allocated.

Colours must be certified before they are used in finished product. When Sensient Colors UK certifies a colour it is given the

USA FD&C name.

FAO/WHO Joint Expert Committee on Food Additives was established by the United Nations and has also established purity specifications for colours, along with test methods. Most of our colours also conform to these monographs and, where applicable, it is mentioned on our specifications.

Other Countries

We have a range of products that are suitable for use in Japan, and information on the suitability of colours in other countries is available on request.

Other Regulatory Issues:

TSE (Transmissable Spongiform Encephalitis) Standard catalogue colours are all free from bovine, ovine and caprine derivatives.

Residual Solvents All of the pharmaceutical colours we supply comply with the ICH guidance on residual solvents, and most are manufactured without any solvents. Statements are available for individual products on request.

GMO

All our standard catalogue products are manufactured using non-GM or Identity Preserved ingredients.

Kosher

We have a kosher certificate to cover the standard catalogue products and some bespoke blends.

Vegetarian

Standard catalogue and most other products are suitable for vegetarians and vegans.

Good Manufacturing Practice

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