Syntethic Dyes
Primary colours are organic colours produced by chemical synthesis.Their exceptional purity allows these colours to be used in foodstuffs, in accordance with regulations: (95/45/ec; fda:cfr 21part.1/99-82.1051).
These regulations specify areas in which colours may be applied, restrictions on their application and dosage (for restrictions on use, see dir. 94/36/ce).
These colours are mainly produced in powder form, but they may also be supplied in granular form or in solution at various concentrations.
Product shelf life, under ideal storage conditions, is 5 years for the product in powder form.
Use of synthetic colours affords several advantages:
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High level of stability
- synthetic colours are generally stable to physical (light, temperature) and chemical (ph, oxidants, etc.) agents. -
Good reproducibility
- Provided the product is high quality, its composition is standardised. this guarantees quality consistency in every batch. minor differences in the appearance of batches of powder have no impact on the behaviour of the colour in solution. both powder and granules may be utilised irrespectively. -
High staining strength
- Recommended dosage in the various applications is expressed in milligrams per kilo of finished product (100-500 ppm). -
Reasonable costs
- They have a low impact on the cost of the finished product.
Available Formulations
Powder
The product is usually employed in powder form. It has a standard concentration which varies according to the product and local legislation.Granular
Granular products, obtained directly from the production lines have a pure dye content which is slightly higher than powder in standard concentration.Chemical and physical properties are the same as for powder, when dissolved in the mean. The advantage lies in the absence of powder during the production process on the client's premises, thereby avoiding contamination of the environment during usage.