Pigment: Difference between revisions

Revision as of 17:42, 18 February 2025

A comprehensive overview of pigments in biological and industrial contexts

Pigments

Various natural and synthetic pigments

Pigments are substances that impart color to other materials. They are used in a wide range of applications, from biological processes to industrial products. Pigments can be found in plants, animals, and microorganisms, and they play crucial roles in processes such as photosynthesis and camouflage. In industry, pigments are used in paints, inks, plastics, and cosmetics.

Biological Pigments

File:Chlorophyll molecule.png

Structure of chlorophyll, a key pigment in photosynthesis

Biological pigments, also known as biochromes, are substances produced by living organisms that have a color resulting from selective color absorption. The most well-known biological pigments are the chlorophylls, which are essential for photosynthesis in plants, algae, and cyanobacteria. Chlorophyll absorbs light most efficiently in the blue portion of the electromagnetic spectrum as well as the red portion.

Other important biological pigments include:

Carotenoids: These are yellow, orange, and red pigments found in plants and some animal tissues. They play a role in photosynthesis and protect chlorophyll from photodamage.
Melanin: A pigment found in the skin, hair, and eyes of animals, providing protection against UV radiation.
Hemoglobin: The red pigment in blood that carries oxygen from the lungs to the rest of the body.
Bilirubin: A yellow pigment formed by the breakdown of hemoglobin in the liver.

Industrial Pigments

Industrial pigments are used to impart color to a variety of products. They are classified into two main types: organic and inorganic pigments.

Organic pigments: These are carbon-based molecules that are often derived from petroleum compounds. They are known for their bright colors and are used in applications where vivid hues are desired, such as in printing inks and textiles.

Inorganic pigments: These are typically metal oxides or other mineral compounds. They are known for their durability and opacity. Common inorganic pigments include titanium dioxide, used for its whiteness and opacity, and iron oxide, used for its range of earthy colors.

Applications of Pigments

Pigments are used in a variety of applications, including:

Paints: Pigments provide color and opacity to paints, which are used for protective and decorative coatings.
Plastics: Pigments are added to plastics to provide color and protect against UV degradation.
Cosmetics: Pigments are used in cosmetics to provide color to products such as lipsticks, eyeshadows, and foundations.
Food coloring: Some pigments are used as food colorants to enhance the appearance of food and beverages.

Environmental and Health Considerations

The production and use of pigments can have environmental and health impacts. Some pigments contain heavy metals, such as lead and cadmium, which can be toxic. The industry has been moving towards more environmentally friendly and non-toxic alternatives.

Related pages

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-'''Pigment''' is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material emits light. Most materials selectively absorb certain wavelengths of light. Materials that humans have chosen and developed for use as pigments usually have special properties that make them useful for coloring other materials. A pigment must have a high tinting strength relative to the materials it colors. It must be stable in solid form at ambient temperatures.
+{{Short description|A comprehensive overview of pigments in biological and industrial contexts}}
-For industrial applications, as well as in the arts, permanence and stability are desirable properties. Pigments that are not permanent are called fugitive. Fugitive pigments fade over time, or with exposure to light, while some eventually blacken.
+==Pigments==
+[[File:Colorful pigments.jpg|thumb|right|Various natural and synthetic pigments]]
+Pigments are substances that impart color to other materials. They are used in a wide range of applications, from biological processes to industrial products. Pigments can be found in [[plants]], [[animals]], and [[microorganisms]], and they play crucial roles in processes such as [[photosynthesis]] and [[camouflage]]. In industry, pigments are used in [[paints]], [[inks]], [[plastics]], and [[cosmetics]].
-Pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food, and other materials. Most pigments used in manufacturing and the visual arts are dry colorants, usually ground into a fine powder. This powder is added to a binder (or vehicle), a relatively neutral or colorless material that suspends the pigment and gives the paint its adhesion.
+==Biological Pigments==
+[[File:Chlorophyll molecule.png|thumb|left|Structure of chlorophyll, a key pigment in photosynthesis]]
+Biological pigments, also known as biochromes, are substances produced by living organisms that have a color resulting from selective color absorption. The most well-known biological pigments are the [[chlorophylls]], which are essential for photosynthesis in plants, algae, and cyanobacteria. Chlorophyll absorbs light most efficiently in the blue portion of the electromagnetic spectrum as well as the red portion.
-A distinction is usually made between a pigment, which is insoluble in its vehicle (resulting in a suspension), and a dye, which either is itself a liquid or is soluble in its vehicle (resulting in a solution). A colorant can act as either a pigment or a dye depending on the vehicle involved. In some cases, a pigment can be manufactured from a dye by precipitating a soluble dye with a metallic salt. The resulting pigment is called a lake pigment. The term biological pigment is used for all colored substances independent of their solubility.
+Other important biological pigments include:
-In 2006, around 7.4 million tons of inorganic, organic, and special pigments were marketed worldwide. Asia has the highest rate on a quantity basis followed by Europe and North America.
+* '''[[Carotenoids]]''': These are yellow, orange, and red pigments found in plants and some animal tissues. They play a role in photosynthesis and protect chlorophyll from photodamage.
+* '''[[Melanin]]''': A pigment found in the skin, hair, and eyes of animals, providing protection against UV radiation.
+* '''[[Hemoglobin]]''': The red pigment in blood that carries oxygen from the lungs to the rest of the body.
+* '''[[Bilirubin]]''': A yellow pigment formed by the breakdown of hemoglobin in the liver.
-== Types of pigments ==
+==Industrial Pigments==
+Industrial pigments are used to impart color to a variety of products. They are classified into two main types: organic and inorganic pigments.
-=== Inorganic pigments ===
+* '''Organic pigments''': These are carbon-based molecules that are often derived from [[petroleum]] compounds. They are known for their bright colors and are used in applications where vivid hues are desired, such as in [[printing inks]] and [[textiles]].
-[[Inorganic pigments]] are pigments which are created by simple chemical reactions such as oxidation. They are usually more resistant to light and heat than organic pigments, and are often used in paints, plastics, and ceramics.
+* '''Inorganic pigments''': These are typically metal oxides or other mineral compounds. They are known for their durability and opacity. Common inorganic pigments include [[titanium dioxide]], used for its whiteness and opacity, and [[iron oxide]], used for its range of earthy colors.
-=== Organic pigments ===
+==Applications of Pigments==
+Pigments are used in a variety of applications, including:
-[[Organic pigments]] are pigments which are created by complex chemical reactions involving carbon. They are usually less resistant to light and heat than inorganic pigments, but offer a wider range of colors.
+* '''[[Paints]]''': Pigments provide color and opacity to paints, which are used for protective and decorative coatings.
+* '''[[Plastics]]''': Pigments are added to plastics to provide color and protect against UV degradation.
+* '''[[Cosmetics]]''': Pigments are used in cosmetics to provide color to products such as lipsticks, eyeshadows, and foundations.
+* '''[[Food coloring]]''': Some pigments are used as food colorants to enhance the appearance of food and beverages.
-=== Biological pigments ===
+==Environmental and Health Considerations==
+The production and use of pigments can have environmental and health impacts. Some pigments contain heavy metals, such as lead and cadmium, which can be toxic. The industry has been moving towards more environmentally friendly and non-toxic alternatives.
-[[Biological pigments]] are substances produced by living organisms that have a color resulting from selective color absorption. Biological pigments include plant pigments and flower pigments.
+==Related pages==
-== See also ==
-* [[Color]]
 * [[Dye]]
-* [[Paint]]
+* [[Color theory]]
-* [[Ink]]
+* [[Photosynthesis]]
-* [[Plastic]]
+* [[Camouflage]]
-* [[Fabric]]
-* [[Cosmetics]]
-* [[Food coloring]]
 [[Category:Pigments]]
 [[Category:Color]]
 [[Category:Materials science]]
-[[Category:Art materials]]
-{{stub}}
-<gallery>
-File:Indian_pigments.jpg|Pigment
-File:Simple_reflectance.svg|Pigment
-File:Complex_reflectance.svg|Pigment
-File:1665_Girl_with_a_Pearl_Earring.jpg|Pigment
-File:Johannes_Vermeer_-_Het_melkmeisje_-_Google_Art_Project.jpg|Pigment
-File:Tizian_041.jpg|Pigment
-File:Accademia_-_Miracle_of_the_Slave_by_Tintoretto.jpg|Pigment
-File:Paul_Cézanne_160.jpg|Pigment
-File:Natural_ultramarine_pigment.jpg|Pigment
-File:Ultramarinepigment.jpg|Pigment
-File:Copper_phthalocyanine.svg|Pigment
-</gallery>