CI 77267 is a chemical compound, a synthetic dye and consists primarily of a mixture of carbon, calcium phosphate and calcium carbonate, derived from animal bones.
Chemical name
Charcoal, bone
Chemical Composition and Structure
CI 77267 is an inorganic compound composed mainly of carbon (C), calcium phosphate (Ca3(PO4)2), and calcium carbonate (CaCO3). This combination gives bone charcoal its characteristic properties, including its distinctive color and high thermal stability.
Physical Properties
This pigment typically appears as a fine black powder. It has a high density and excellent covering power. CI 77267 is known for its chemical stability and resistance to light and heat, making it suitable for long-lasting applications.
Chemical Industrial Synthesis Process
- Preparation of reagents. The main raw materials include animal bones, primarily bovine bones.
- Cleaning and selection. The bones are collected, cleaned, and selected to remove impurities and undesirable materials.
- Drying. The cleaned bones are dried at controlled temperatures to remove residual moisture.
- Pyrolysis. The dried bones are subjected to pyrolysis in a high-temperature furnace (generally between 500°C and 900°C) in an oxygen-free environment. This process transforms the bones into bone charcoal, primarily composed of carbon, calcium phosphate, and calcium carbonate.
- Cooling. The bone charcoal is slowly cooled to prevent cracks or fractures.
- Crushing and grinding. The cooled bone charcoal is crushed and ground into a fine powder.
- Washing. The bone charcoal powder is washed with deionized water to remove any soluble impurities.
- Drying. The washed bone charcoal is dried at controlled temperatures to remove residual moisture and obtain a dry powder.
- Classification. The dried powder is classified to ensure a uniform particle size using sieves or air classifiers.
- Stabilization. The CI 77267 powder is stabilized to ensure its stability during transportation and storage, preventing aggregation and degradation.
- Quality control. The CI 77267 undergoes rigorous quality testing to ensure it meets standards for purity, color intensity, and safety. These tests include chemical analysis, spectroscopy, and physical tests to determine particle size and rheological properties.
What it is used for and where
CI 77267, also known as bone charcoal, is chemically classified as an inorganic colorant. This pigment primarily consists of a mixture of carbon, calcium phosphate, and calcium carbonate.
Cosmetics
Restricted cosmetic ingredient as IV/127 a Relevant Item in the Annexes of the European Cosmetics Regulation 1223/2009.
Cosmetics - INCI Functions
- Colorant. This ingredient has the function of colouring the solution in which it is inserted in a temporary, semi-permanent or permanent manner, either alone or in the presence of the complementary components added for colouring.
CI 77267 is used in cosmetic products such as eyeliners, mascaras, and eyeshadows due to its intense black color and high opacity.
Industrial Applications
Paints and Coatings: In the paint industry, bone charcoal is used to achieve deep black shades and enhance UV resistance. Its stability and strong tinting properties make it ideal for both decorative and protective coatings.
Plastics and Polymers: This pigment is employed in the production of plastics and polymers to improve color uniformity and opacity. It is commonly used in products like automotive parts, packaging materials, and consumer goods.
Inks: CI 77267 is used in printing inks for its high color strength and permanence. It ensures sharp, dark prints and is used in various types of inks including those for newspapers, magazines, and packaging.
Filtration: Bone charcoal is also used in water and air filtration systems due to its adsorptive properties, which help remove impurities and contaminants.
Safety
CI 77267, or bone charcoal, is a versatile and widely used inorganic pigment with applications across numerous industries. Its excellent physical and chemical properties, including intense black color, high stability, and non-reactivity, make it a valuable component in cosmetics, paints, plastics, inks, and filtration systems. Ongoing research and development continue to enhance its applications and performance, contributing to its widespread utility and environmental management.
CAS 8021-99-6
EC number 232-421-2
UNII 8X7LUT95FD
Synonyms:
DC Black No. 3
Pigment Black 9
Charcoal, bone
CI 77267
