Allura red ac CAS：25956-17-6

Allura Red AC appears as a deep red, homogeneous, odorless powder. It is readily soluble in water, glycerin, and propylene glycol, sparingly soluble in ethanol, and insoluble in oils and fats. Its aqueous solution is transparent red with subtle yellow undertones. The dye exhibits robust stability to light and heat, but is susceptible to degradation under alkaline conditions and upon exposure to redox agents, in line with the typical behaviour of azo-based red pigments.

Allura Red AC (CAS 25956-17-6) – Parameters & Safety Data

Table 1: Physicochemical Properties

Table 2: Safety Information

Key Advantages of Allura Red AC

• Broad Regulatory Acceptance
  Globally authorized as FD&C Red 40 (USA), E129 (EU), and CI 16035 (Colour Index). This harmonized approval profile across major markets greatly simplifies international trade and product formulation.

• Excellent Solubility Profile
  Readily dissolves in water, glycerin, and propylene glycol, with a solubility of 53.878 g/L in water at 25 °C. It is also soluble in ethanol. This versatility ensures smooth integration into a wide range of aqueous, hydroalcoholic, and semi-solid matrices without the need for special solubilizers. Crucially, it is insoluble in oils and fats, preventing unwanted migration into lipid phases.

• Superior Processing Stability
  The dye exhibits strong resistance to heat, maintaining colour integrity during pasteurization, baking, and other high-temperature processes. It also displays robust light fastness in application, making it suitable for products exposed to illumination on retail shelves. While the dry powder is hygroscopic and should be stored protected from light, the colourant performs reliably once formulated.

• pH-Controlled Colour Versatility
  Allura Red AC offers a distinctive pH-dependent shade range: it produces a clear, bright red in neutral to acidic conditions and shifts to a deeper red tone in alkaline environments. This allows manufacturers to fine-tune the final appearance simply by adjusting the product's pH, providing a built-in colour tool for differentiation.

• High Tinctorial Strength and Purity
  The product is a dark red, homogeneous, odourless powder with an extinction coefficient (ε) of ≥20,000 (501–507 nm, 0.01 g/L in water) and λmax at 504 nm. This high colour strength means low usage levels deliver vivid shades, offering excellent cost-in-use and minimal impact on the formulation’s physical properties.

• Clean Sensory Profile
  As an odourless powder that forms a transparent red solution with subtle yellow undertones, it imparts strong colour without introducing off-odours, off-flavours, or turbidity. This makes it particularly suitable for clear beverages, jellies, and oral pharmaceutical syrups where sensory neutrality is critical.

• Aqueous Application Suitability
  Being water-soluble and oil-insoluble, Allura Red AC is ideal for water-based systems, including soft drinks, confectionery, dairy alternatives, and personal care gels. It does not bleed into fatty phases, ensuring colour remains where it is intended.

• Well-Documented Safety Profile
  Classified with safety statements 22-24/25 (do not breathe dust; avoid contact with skin and eyes) and a moderate water hazard class (WGK 2), the colourant has a long history of safe use when handled according to standard occupational practices. It is listed on the EPA Substance Registry and in major chemical inventories, confirming its well-characterized toxicological standing.

• Value-Added Biofunctional Potential
  Beyond colouring, Allura Red AC has been investigated for therapeutic applications, including use in antifungal formulations and in the management of bone metabolic diseases, rhinitis, coughing, sneezing, rhinorrhea, nasal obstruction, and periodontal disease. This emerging bioactivity profile opens avenues for functional food, nutraceutical, and pharmaceutical innovation.

• Stable Supply and Quality Consistency
  Covered by HS Code 29270000 and supported by well-established analytical specifications (melting point >300 °C, Merck index 14,284, etc.), Allura Red AC is produced under rigorous quality controls. This ensures batch-to-batch uniformity in colour, solubility, and purity, which is essential for industrial-scale reproducibility.