FD&C BLUE NO. 1, ALUMINUM LAKE

CAS: 68921-42-6 COLOR OR COLORING ADJUNCT

FD&C Blue No. 1 Aluminum Lake is a water‑insoluble pigment form of the synthetic food color FD&C Blue No. 1 used to impart blue color in foods, drugs, cosmetics, and other products under regulatory controls.

What It Is

FD&C Blue No. 1 Aluminum Lake is a food additive classified as a color or coloring adjunct composed of the aluminum salt of the synthetic dye commonly known as FD&C Blue No. 1. In regulatory inventories, it is listed under CAS number 68921‑42‑6, and it is one of several lake forms of this dye used where a water‑insoluble pigment is desirable. Lakes are produced by precipitating a water‑soluble dye onto an insoluble substrate such as aluminum hydroxide, resulting in a pigment that disperses well in fat‑based or dry food systems and reduces migration of the colorant in aqueous environments. This ingredient is part of the broader group of FD&C color additives that undergo certification by regulatory agencies before use in foods, drugs, and cosmetics. FD&C Blue No. 1 Aluminum Lake serves a similar function to its parent colorant, FD&C Blue No. 1, but is intentionally engineered to be insoluble for certain applications. The ‘‘FD&C" designation in the name indicates that it is recognized under the Federal Food, Drug, and Cosmetic Act for use in the United States when meeting specific identity and purity requirements and used in compliance with regulations. The lake form is used to provide consistent and stable color effects in products where a soluble dye might not perform as well. The term ‘‘lake" itself denotes that the dye molecule is bound to a substrate, which can influence its dispersion properties and appearance in the final product. This additive is part of a class of synthetic colorants widely used in modern food manufacturing, where visual appeal and product consistency are important. It is chemically related to Brilliant Blue FCF (FD&C Blue No. 1), a well‑established synthetic dye with a long history of regulatory evaluation worldwide. The aluminum lake variant is adapted for formulations requiring pigment‑type colorants rather than soluble dyes.

How It Is Made

The manufacture of FD&C Blue No. 1 Aluminum Lake begins with the synthesis of the parent dye, FD&C Blue No. 1, which is derived by the condensation of appropriately substituted benzene sulfonic acids and aniline derivatives followed by oxidation to form an extended conjugated aromatic structure. Once the straight (soluble) dye is produced, it is precipitated onto an insoluble substrate such as aluminum hydroxide through a controlled reaction. The aluminum ions serve as the ‘‘lake" substrate, binding the dye molecules and forming a stable, water‑insoluble pigment. In industrial practice, the process typically involves dissolving the straight dye in an aqueous medium and adding a source of aluminum ions under conditions that promote precipitation. The resulting lake particles are then washed to remove unbound dye and impurities, filtered, and dried to yield a free‑flowing powder. The amount of dye adsorbed onto the substrate and the choice of substrate affect the final color intensity and shade. The chemistry behind lakes is not a simple molecular reaction but rather a physical association between the dye molecules and the inorganic substrate. During laking, the dye adheres to the surface of the aluminum hydroxide through a combination of ionic interactions and physical adsorption. This process creates a pigment that retains the hue of the parent dye but functions differently in formulations due to its insolubility. Quality control measures in manufacturing ensure that the lake meets regulatory specifications for color content, particle size, and purity, including limits for heavy metals and other impurities. Such specifications are part of regulatory certification processes, such as those conducted by the U.S. Food and Drug Administration for color additives intended for use in food and other products.

Why It Is Used In Food

FD&C Blue No. 1 Aluminum Lake is used in foods primarily to provide blue color in matrixes where a soluble dye would not be suitable or might migrate away from the intended area of the product. For example, in fat‑rich or oil‑based foods, the water‑soluble form of the dye may not disperse evenly or might bleed, resulting in uneven color distribution. The lake form, being water‑insoluble, can remain uniformly distributed in non‑aqueous and low‑moisture systems. Color plays an important role in consumer perceptions of food quality and appeal. Blue hues are used in a range of products, from confections and dairy desserts to frostings and beverage powders, to create visual cues that signal particular flavors or product themes (such as ‘‘blue raspberry"). In bakery products, toppings, and coated snacks, the lake form can provide a stable color that resists migration during storage and handling. Beyond foods, the technical function of this additive extends into related applications in drugs and cosmetics, where consistent and stable coloration is also desirable. In these contexts, the lake form helps maintain color integrity in formulations such as tablets, capsules, eye makeup, and lip products. In pharmaceutical tablets, for instance, the lake form can help maintain distinct color bands or coatings that aid in product identification. In cosmetics, lakes are common in eyeshadows, blushes, and other products requiring finely dispersed pigments. In all these applications, the use of a lake rather than a soluble dye aligns with formulation needs for pigmentary color rather than tinting solutions.

Adi Example Calculation

As an illustrative example of how an acceptable daily intake might be applied in practice, consider a hypothetical ADI of 6 mg per kg body weight per day for a parent dye such as Brilliant Blue FCF (as identified by expert evaluations for the soluble dye in some contexts). For an individual weighing 70 kilograms, the ADI would translate to up to 420 mg of the colorant per day (6 mg/kg x 70 kg). This hypothetical calculation demonstrates how body weight is factored into exposure assessments, ensuring that larger individuals have proportionally higher intake thresholds compared to smaller individuals. It is essential to emphasize that this calculation is illustrative and not personal advice about consumption. Actual dietary exposures are typically far below this level due to the relatively low concentrations of color additives permitted in food products. Manufacturers formulate products to achieve the desired color effect at minimal usage levels, and regulatory limits for specific food categories further constrain the amount that can be present in any given product. Using ADI values in conjunction with food consumption data, regulators can estimate population‑level exposures and adjust regulatory parameters if new data indicate changes in consumption patterns or toxicological understanding. The ADI thus serves as a practical tool for ongoing safety management rather than a target for consumers to approach in daily life.

Safety And Health Research

Safety evaluations for synthetic food colors such as FD&C Blue No. 1 and its lake forms focus on toxicological data collected over many years, including studies on absorption, metabolism, and long‑term effects in laboratory animals. Regulatory agencies review data on parameters such as genotoxicity, chronic toxicity, and reproductive endpoints to determine whether a color additive can be used safely at levels expected in the diet. For Brilliant Blue FCF, the parent dye related to FD&C Blue No. 1 and its derivatives, JECFA has established an acceptable daily intake range based on toxicological studies demonstrating no observed adverse effects at doses substantially higher than typical dietary exposures. This assessment incorporates uncertainty factors to account for differences between animals and humans and variability within human populations. Overall, regulators around the world have concluded that, when used in compliance with authorized conditions and within established limits, synthetic dyes like FD&C Blue No. 1 and its lake forms do not present health concerns at expected intake levels. Ongoing monitoring by food safety authorities continues to evaluate emerging scientific data to ensure that permitted uses remain appropriate. Scientists and regulators pay attention to potential impurities, such as heavy metals or byproducts of synthesis, which are controlled through purity specifications and certification processes. This focus on impurities helps maintain a high level of safety assurance, separate from the intrinsic properties of the dye molecules themselves. While specific health effects in sensitive individuals are periodically investigated, broad regulatory evaluations emphasize that the general population’s exposure to color additives is low relative to levels at which toxic effects have been observed in controlled studies. Safety assessments also consider dietary patterns across age groups and population subgroups, recognizing that certain individuals may consume more color‑containing products than others. The combination of toxicology data, exposure assessments, and regulatory oversight contributes to the ongoing assurance that permitted color additives can be used without undue risk when industry complies with regulatory standards.

Regulatory Status Worldwide

In the United States, FD&C Blue No. 1 Aluminum Lake is regulated as a color additive subject to certification by the Food and Drug Administration (FDA). It is listed under Title 21 of the Code of Federal Regulations, and its use in foods, drugs, and cosmetics is contingent on meeting specific identity, purity, and labeling requirements. Regulations such as 21 CFR 74.1101 and related sections outline that FD&C Blue No. 1 Aluminum Lake may be used for coloring drugs intended for use in the area of the eye and under good manufacturing practice in other products. Each batch of certified color additive must be submitted to the FDA for analysis to ensure compliance with established specifications before it can be marketed. This certification process is designed to protect public health by ensuring that certified batches meet rigorous quality standards. In international regulatory frameworks, the parent dye Brilliant Blue FCF (associated with INS/E number 133) has been evaluated by bodies such as the Joint FAO/WHO Expert Committee on Food Additives (JECFA), which established an acceptable daily intake range for the parent compound. JECFA evaluations inform Codex Alimentarius standards and are considered by many national authorities when setting local regulations. In the European Union, the color designated as E133 corresponds to Brilliant Blue FCF and subject to maximum permitted levels in various food categories established by EU regulations. While much of the regulatory literature focuses on the soluble dye form, the lake variant is typically encompassed under the broader approvals for the same colorant family, provided it meets compositional and purity requirements. Other countries follow similar regulatory mechanisms, requiring that food color lakes be assessed for safety, purity, and labeling before use. In all cases, these regulatory frameworks share common objectives: ensuring the colorant performs its intended technological function without introducing unacceptable risks to consumers, and providing transparent information for industry compliance and consumer awareness.

Taste And Functional Properties

FD&C Blue No. 1 Aluminum Lake itself does not contribute a taste or flavor to food products at typical usage levels; its role is purely visual. As a pigment, it provides a blue color without imparting sweetness, bitterness, or other taste sensations. Sensory perception of color can influence how consumers perceive the flavor of a product, even though the colorant does not alter the actual flavor chemistry. Functionally, the lake form has distinct properties compared to the water‑soluble dye. It is insoluble in water, which means it does not dissolve to form a colored solution but rather disperses as tiny particles throughout a product. This insolubility is advantageous in fat‑based foods, coatings, and dry mixes, where the pigment particles can remain suspended and maintain a uniform appearance. Because the pigment is dispersed rather than dissolved, it tends not to migrate as readily in aqueous phases, helping to preserve sharp color demarcations. The stability of the lake pigment to heat, light, and pH changes influences how it performs during processing and storage. In many applications, FD&C Blue No. 1 Aluminum Lake exhibits reasonable stability to typical food processing conditions, although extreme heat or highly acidic or alkaline environments can affect the color intensity over time. Manufacturers take such factors into account when selecting colorants for specific formulations. The pigment’s particle size and dispersibility can also influence the final visual effect; finer particles may yield more uniform appearance, while larger particles may impart a slightly different luster or texture in certain products.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept used by scientific committees to indicate the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For color additives like FD&C Blue No. 1 and its related compounds, ADIs are established based on toxicological studies in laboratory animals, identifying doses at which no adverse effects are observed, and applying safety factors to account for differences between animals and humans and variability within human populations. These safety factors create a margin of protection intended to ensure that even high consumers of the additive remain well below levels associated with adverse outcomes. It is important to understand that an ADI is not a recommended intake level or a threshold that must be achieved; rather, it serves as a conservative safety benchmark. Actual dietary exposures in typical consumer populations are generally much lower than the ADI, reflecting the relatively low quantities of color additives used in food products. The ADI concept helps regulators set maximum permitted levels in specific food categories and guides industry in formulating products that remain within safe exposure limits. Different jurisdictions may adopt the ADI values identified by expert panels such as JECFA or those from regional evaluations such as by the European Food Safety Authority (EFSA). In all cases, the ADI provides a transparent basis for regulatory decisions and a framework for ongoing safety assessment as new scientific data become available. By using ADIs in conjunction with food consumption data, regulators can estimate dietary exposures and ensure that approved uses of additives remain within safe boundaries for all population groups.

Comparison With Similar Additives

FD&C Blue No. 1 Aluminum Lake is one of several synthetic color pigments used in food and related products. Compared to water‑soluble dyes such as FD&C Blue No. 1 (the parent dye), the lake form is insoluble and thus better suited for non‑aqueous or low‑moisture systems where soluble dyes might migrate or bleed. Another synthetic blue colorant, FD&C Blue No. 2 (Indigo Carmine), also has lake forms for similar applications, but differs in hue, providing a deeper blue shade. Both pigments serve similar technological functions but are chosen based on the desired color tone and formulation needs. In the context of other color families, synthetic red lakes such as FD&C Red No. 40 Aluminum Lake are analogous to blue lakes in that they provide stable pigments for fat‑based or dry applications. The choice between a blue lake and a red lake often depends on the target hue and product category; for example, a purple shade might be achieved by combining blue and red lakes in a dry mix. Similarly, yellow lakes such as FD&C Yellow No. 5 Lake provide complementary shades for multi‑color product designs. Each of these lakes shares the common characteristic of being an insoluble pigment form of a water‑soluble dye, chosen to meet specific formulation goals where pigment color performance is needed. Natural colorants such as anthocyanins or spirulina extracts offer alternative blue hues for formulators seeking non‑synthetic options, but these alternatives often present challenges related to pH sensitivity, heat instability, or limited shade range. In contrast, synthetic lakes like FD&C Blue No. 1 Aluminum Lake provide consistent and stable color performance across a range of processing conditions. The selection among these colorants involves balancing technological requirements, regulatory status, consumer preferences, and formulation constraints.

Common Food Applications Narrative

In modern food manufacturing, color has become a key aspect of product design and consumer appeal. FD&C Blue No. 1 Aluminum Lake is one of the pigments used to deliver vibrant blue hues in a variety of food and beverage categories. In confectionery products such as gummies, hard candies, and icing, the lake form is chosen for its ability to remain evenly dispersed without bleeding into adjacent components. For example, in decorative icings on cakes and cupcakes, the pigment can provide a consistent and visually appealing blue surface that meets consumer expectations. In frozen treats and dessert applications, such as blue‑colored sherbets, ice pops, and flavored frozen desserts, the stability of the lake pigment helps maintain color integrity through processing and temperature changes. Powdered beverage mixes and drink powders also make use of pigment lakes to ensure that the color remains stable until rehydration by the consumer. Dry mixes for flavored drinks and gelatin desserts benefit from the lake form’s insolubility, which helps maintain a vivid color when the product is prepared according to directions. In dairy products and flavored milk beverages, blue color lakes can be part of themed or limited‑edition products where visual impact is essential for marketing. Breakfast cereals and snack coatings may incorporate FD&C Blue No. 1 Aluminum Lake in multicolor patterns that attract attention on retail shelves. In each of these categories, the lake pigment must function reliably under the product’s specific processing conditions, whether that involves baking, freezing, high shear mixing, or extended storage. The use of FD&C Blue No. 1 Aluminum Lake is typically listed on product labels under its common names, allowing consumers to identify the source of the color. While the amount used in any given product is generally low relative to the bulk ingredients, the color effect can have a substantial impact on consumer perception of freshness, flavor, and overall quality. The breadth of applications demonstrates the versatility of this pigment in delivering aesthetic qualities without altering the taste or physical structure of the food itself.

Safety & Regulations

FDA

  • Notes: Regulatory listing for FD&C Blue No. 1 and its aluminum lake exists but certification requirements must be met; explicit approved=true not assigned without direct source evidence.
  • Regulation: 21 CFR 74.1101

EFSA

  • Notes: EFSA evaluates the parent dye Brilliant Blue FCF (E133) with ADI but explicit numeric values for the lake variant not directly verified.
  • E Number: E133

JECFA

  • Notes: JECFA ADI range for parent dye established; year not explicitly shown on d deep link.
  • Ins Number: 133
  • Adi Display: 0-6 mg/kg bw
  • Adi Mg Per Kg: 6

Sources

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