PRODUCTS

INDANTHRENE BLUE RS

The main use of Indanthrene Blue RS in the food industry is in coloring candies, beverages, frozen desserts and other products where an intense blue color is desired.
Indanthrene blue RS can also be used in combination with other dyes to create a wide range of shades and colors.
Indanthrene blue RS is a pigment that can be used in the following media: acrylic, alkyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting.

CAS Number: 81‑77‑6
EC Number: Not clearly listed, but it corresponds to C.I. Vat Blue 4 /
Preferred IUPAC name: 6,15-Dihydrodinaphtho[2,3-a:2′,3′-h]phenazine-5,9,14,18-tetrone
Molecular formula: C₂₈H₁₄N₂O₄
Molar mass: 442.43 g/mol

SYNONYMS:
Indanthrene Blue RS, Indanthrone Blue, C.I. Vat Blue 4, Carbon Paper Blue, Blue O, Carbanthrene Blue 2R, Fenan Blue RSN, Graphtol Blue RL, Medium Blue, Monolite Fast Blue 3R, Pigment Blue 60, C.I. 69800, Indanthrene, Indanthrone, Preferred IUPAC name: 6,15-Dihydrodinaphtho[2,3-a:2′,3′-h]phenazine-5,9,14,18-tetrone, C.I. vat blue 4, carbon paper blue, blue O, carbanthrene blue 2R, fenan blue RSN, graphtol blue RL, medium blue, monolite fast blue 3R, indanthrene, indanthrone, pigment blue 60, C.I. 69800, 81-77-6, 201-375-5, 5,9,14,18-ANTHRAZINETETRONE, 6,15-DIHYDRO-, 6,15-DIHYDRO-5,9,14,18-ANTHRAZINETETRONE, C.I. 69800, C.I. PIGMENT BLUE 60 [HSDB], CARBANTHRENE BLUE RS, CI 69800, CIBANONE BLUE, FOOD BLUE 4, INDANTHRENE [MI], INDANTHRENE BLUE RS, INDANTHRONE, INDANTHRONE BLUE, NSC-47739, NSC-652900, PALANTHRENE BLUE GPT, PIGMENT BLUE 60, VAT BLUE 4

Indanthrene blue RS is a clean deep blue pigment.
Indanthrene blue RS is fully lightfast and is a transparent colour.
Indanthrene blue RS is a modern organic pigment and was originally introduced into the Winsor & Newton range in 1991.

Indanthrene blue RS is a pigment that can be used in the following media: acrylic, alkyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting.
Indanthrene blue RS is used to dye unmordanted cotton and as a pigment in quality paints and enamels.

As a food dye, Indanthrene blue RS has E number E130, but it is not approved for use in either the United States or the European Union.
Indanthrene blue RS has excellent light fastness, but may bleed in some organic solvents.
Indanthrone blue, also called Indanthrene blue RS, is an organic compound with the formula (C14H6O2NH)2.

Indanthrene blue RS is a dark blue solid that is a common dye as well as a precursor to other dyes.
Indanthrene blue RS's CAS number is [6-30-98] and its SMILES structure is O=C(C(C(NC(C=CC(C(C7=C6C=CC=C7)=O)=C5C6=O)=C5N4)=C4C=C3)=C3C2=O)C1=C2C=CC=C1.

Indanthrene blue RS, also known as E130, is a synthetic food colorant used to give foods an intense blue hue.
Indanthrene blue RS is a chemical compound that has gained popularity in the food industry due to its unique coloring properties.
Indanthrene blue RS belongs to the indigo group of dyes, which are synthesized from indigo.

Indanthrene blue RS's use in food products is regulated in many countries.
For this reason, Indanthrene blue RS is important for food manufacturers and consumers to be aware of local regulations regarding the use of this dye.

Indanthrene Blue RS is a dark-blue anthraquinone vat dye/pigment with extraordinary fastness, thermal and chemical stability, making it suitable for demanding textile, coating, and artistic applications, as well as advanced material sciences.
While safe to handle with proper PPE, Indanthrene blue RS requires caution against dust exposure and environmental release.

Indanthrene blue RS's food additive use (E130) is restricted in many regions.
Indanthrene Blue RS was patented in 1901 by Rene Bohn as the first anthraquinone vat dye, one of the dyes with very good fastness to light and washing.

Indanthrone blue, also called Indanthrene blue RS, is an organic compound with the formula (C14H6O2NH)2.
Indanthrene blue RS is a dark blue solid that is a common dye as well as a precursor to other dyes.

USES and APPLICATIONS of INDANTHRENE BLUE RS:
Food additive: Known as Indanthrene blue RS, though not approved in the US/EU for food use
Indanthrene blue RS is a pigment that can be used in the following media: acrylic, alkyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting.

Indanthrene blue RS is used to dye unmordanted cotton and as a pigment in quality paints and enamels.
As a food dye, Indanthrene blue RS has E number E130, but it is not approved for use in either the United States or the European Union.
Indanthrene blue RS has excellent light fastness, but may bleed in some organic solvents.

Indanthrene blue RS is a pigment that can be used in the following media: acrylic, alkyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting.

-Organic Semiconductor uses of Indanthrene blue RS:
As an organic semiconductor, Indanthrene blue RS has capabilities for utilization as a photocatalyst for oxygen generation from water utilizing solar energy.
Indanthrene blue RS's characteristic as a nonlinear optics light absorber allows for its use as an optical limiter, which can be employed, for instance, in laser protective filters.

-Colorant uses of Indanthrene blue RS:
Indanthrene blue RS is utilized as a blue pigment (C.I. Pigment Blue 60), primarily in the process of vat dyeing, often referred to as C.I. Vat Blue 4.

Indanthrene blue RS is a vat dye, synthesized to provide highest color fastness for the dyeing and printing of predominantly cellulose-based textile fibers.
Fabrics dyed with Indanthrene blue RS fulfill the highest standards and exhibit exceptional wash fastness, boil fastness, light fastness, weather fastness and chlorine fastness.

-Industry uses of Indanthrene blue RS:
Vat dye for cellulose fibers (unmordanted cotton) – known for superb wash, light, boil, weather, chlorine fastness
Pigment in high-quality paints, enamels, inks, plastic and rubber matrices (e.g., automotive coatings)

Art medium: Used in watercolor, oil, acrylic as Pigment Blue 60 (PB60) – deep blue hue, semi-staining
Organic semiconductor & photocatalyst: Applied in photocatalysis (e.g., oxygen generation) and optical limiting (“laser protective filters”)

ORGANIC SEMICONDUCTOR OF INDANTHRENE BLUE RS:
As an organic semiconductor, Indanthrene blue RS has capabilities for utilization as a photocatalyst for oxygen generation from water utilizing solar energy.
Indanthrene blue RS's characteristic as a nonlinear optics light absorber allows for its use as an optical limiter, which can be employed, for instance, in laser protective filters.

PROPERTIES OF INDANTHRENE BLUE RS:
Indanthrene Blue RS is known for its exceptional resistance to fading, heat and light.
These properties make Indanthrene blue RS a long-lasting dye, ideal for use in products that are exposed to long-term storage or processing.
In addition, Indanthrene blue RS exhibits good water solubility, making it easy to use in different types of foods.

✅ BENEFITS & CHARACTERISTICS OF INDANTHRENE BLUE RS:
*Exceptional fastness:
Outstanding resistance to light, washing, heat, weather, chlorine

*Rich coloration:
Deep, clear blue-black tones; mixes well for shading

*Thermal stability:
Tolerates ~300 °C in polyolefin with minimal color change

*Semiconductor activity:
Useful in advanced materials tech

PREPARATION OF INDANTHRENE BLUE RS:
Indanthrene blue RS is made from 2-aminoanthraquinone treated with potassium hydroxide.
By dimerization of 2-aminoanthraquinone under strongly alkaline conditions at 220-235 °C, the intermediate is obtained in two steps, which cyclizes intramolecularly and is oxidized to indanthrone.

COLORANT OF INDANTHRENE BLUE RS:
Indanthrene blue RS is utilized as a blue pigment (C.I. Pigment Blue 60), primarily in the process of vat dyeing, often referred to as C.I. Vat Blue 4.

WHERE TO BUY RS INDANTHRENE BLUE RS?
Indanthrene blue RS is mainly available to industrial manufacturers and can be purchased through specialized food raw material supply companies.
For individual consumers, the availability of this colorant may be limited, so it is recommended to look for Indanthrene blue RS in online stores specializing in food additives.
Indanthrene blue RS is worth contacting the sales department of Foodcom S.A.

HISTORY OF INDANTHRENE BLUE RS:
René Bohn (1862–1922) discovers a new blue dye in 1901.
Indanthrene Blue RS surpasses indigo in colorfastness and lightfastness.

The resulting high-quality indanthrene vat dyes (water-insoluble textile dyes) lead to new application opportunities in textile dyeing and printing.
The introduction of indigo and indanthrene in the practice is decisively promoted by the reduction and vatting agent “Hydrosulfite Conc. BASF” and Rongalit which convert the dyes into a water-soluble form during the dyeing process.

TRADEMARK OF INDANTHRENE BLUE RS:
Indanthrene blue RS blue was the first example of the brand "Indanthren" (an acronym for Indigo from anthracene) introduced by BASF in 1901.
One result is that even now, in Japan vat dyes are commonly described as threne dyes (スレン染料), derived from the Japanese transliteration of the brand.

When used as a food dye, Indanthrene blue RS has E number E130.
Indanthrene blue RS was patented in 1901 by Rene Bohn as the first anthraquinone vat dye, one of the dyes with very good fastness to light and washing.
Indanthrene blue RS is used to dye unmordanted cotton and as a pigment in quality paints and enamels.

FUNCTIONS OF INDANTHRENE BLUE RS IN FOODS:
Indanthrene blue RS plays a key role in the aesthetics of food products, by giving them an attractive, intense color.
Indanthrene blue RS's use can also affect consumers’ perception of taste, although the dye itself has no flavor properties.
In addition, Indanthrene blue RS's stability and resistance to various storage conditions make it an attractive choice for manufacturers looking for durable coloring solutions.

CHEMICAL STRUCTURE & PRODUCTION OF INDANTHRENE BLUE RS:
Structure: Anthraquinone dimer linked via two –NH groups
Synthesis:
Indanthrene blue RS is produced by base-induced dimerization of 2-aminoanthraquinone at 220–235 °C, followed by cyclization/oxidation

PHYSICAL and CHEMICAL PROPERTIES of INDANTHRENE BLUE RS:
Chemical name: 6,15-Dihydrodinaphtho[2,3‑a:2′,3′‑h]phenazine‑5,9,14,18‑tetrone
CAS: 81‑77‑6
EC number: Not clearly listed, but it corresponds to C.I. Vat Blue 4 / C.I. 69800
PubChem ID: 6690
ChemSpider ID: 6435
Appearance: Dark blue solid—needle crystals with metallic luster or fine powder
Molecular formula: C₂₈H₁₄N₂O₄; molar mass ≈ 442.43 g/mol
Density: ~1.45–1.6 g/cm³
Melting point: ~470–500 °C (decomposes)

Boiling point: ~740 °C (at 760 mmHg) per estimation
Solubility: Insoluble in water; very low (<0.1 g/100 mL at 21 °C)
Slight solubility in hot chloroform, o‑chlorophenol, quinoline;
insoluble in ethanol, acetone, pyridine, toluene, xylene, acetic acid
Chemical behavior: Turns brown in conc. H₂SO₄ (orange then dissolves);
forms blue in alkaline and red–blue in acid solutions
Optical: UV max ≈ 278 nm
Refractive index: ~1.746

pH of slurry: ~6.1–6.3 (10% w/v)
Bulk density: ~400–600 kg/m³
Particle size: ~0.08 µm; surface area: 40–57 m²/g
Oil absorption: 27–80 g/100 g
Chemical formula: C28H14N2O4
Molar mass: 442.430 g·mol−1
Appearance: dark blue solid
Density: 1.6 g/ml
Melting point: 470-500 °C (decomposes)
Solubility in water: Insoluble

FIRST AID MEASURES of INDANTHRENE BLUE RS:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of INDANTHRENE BLUE RS:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.

FIRE FIGHTING MEASURES of INDANTHRENE BLUE RS:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of INDANTHRENE BLUE RS:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of INDANTHRENE BLUE RS:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.

STABILITY and REACTIVITY of INDANTHRENE BLUE RS:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available