News tagged with pigment
Poultry drug increases levels of toxic arsenic in chicken meat
(Medical Xpress)—Chickens likely raised with arsenic-based drugs result in chicken meat that has higher levels of inorganic arsenic, a known carcinogen, according to a new study led by researchers at theJohns Hopkins Center ...
Health
May 13, 2013 |
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Red hair pigment might raise melanoma risk, study says
(HealthDay)—The red in redheads' hair is thought to put them at increased risk of the dangerous skin cancer melanoma, even if they don't spend a lot of time in the sun, according to a new study.
Cancer
May 09, 2013 |
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New understanding of how we see colors
(Medical Xpress)—Scientists have until now not fully understood how animals see in color, since visual pigments in eyes contain exactly the same chromophore (light absorbing segment of the molecule) and yet can absorb different ...
Medical research
Dec 07, 2012 |
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Modern life may cause sun exposure, skin pigmentation mismatch
As people move more often and become more urbanized, skin color—an adaptation that took hundreds of thousands of years to develop in humans—may lose some of its evolutionary advantage, according to a Penn State anthropologist.
Health
Feb 16, 2013 |
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Laser treatment can make your brown eyes blue
Just like the old Crystal Gayle song, a new laser technology could soon allow you to turn those boring brown eyes of your to a rich and beautiful blue. But you better make sure that blue eyes are what you really want because ...
Other
Nov 04, 2011 |
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Scientists find vitamin D crucial in human immune response to tuberculosis
Not just important for building strong bones, an international team of scientists has found that vitamin D also plays an essential role in the body's fight against infections such as tuberculosis.
Medical research
Oct 12, 2011 |
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Eye color may indicate risk for serious skin conditions
Eye color may be an indicator of whether a person is high-risk for certain serious skin conditions. A study, led by the University of Colorado School of Medicine, shows people with blue eyes are less likely to have vitiligo. ...
Genetics
May 06, 2012 |
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Study finds linchpin of skin response to UVA light
Last year, a team of researchers at Brown University discovered that certain skin cells use a light-sensitive receptor found outside of the eye to sense ultraviolet light and quickly begin pumping out melanin ...
Medical research
Jan 21, 2013 |
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New melanoma driver genes found in largest DNA sequencing study to date
(Medical Xpress) -- Yale Cancer Center geneticists, biochemists, and structural biologists have painted the most comprehensive picture yet of the molecular landscape of melanoma, a highly aggressive and often ...
Genetics
Jul 29, 2012 |
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Missing pieces of DNA structure is a red flag for deadly skin cancer
Melanoma is the most dangerous type of skin cancer and is the leading cause of death from skin disease. Rates are steadily increasing, and although risk increases with age, melanoma is now frequently seen in young people.
Cancer
Sep 13, 2012 |
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Unexpected factor contributes to melanoma risk in red-haired, fair-skinned individuals
The well-established elevated risk of melanoma among people with red hair and fair skin may be caused by more than just a lack of natural protection against ultraviolet (UV) radiation. In an article receiving Advance Online ...
Cancer
Oct 31, 2012 |
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Cells from skin create model of blinding eye disease
For the first time, Wisconsin researchers have taken skin from patients and, using induced pluripotent stem cell (iPSC) technology, turned them into a laboratory model for an inherited type of macular degeneration.
Genetics
Nov 08, 2012 |
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Three new gene faults found to increase melanoma risk by 30 percent
An international team of researchers has discovered the first DNA faults linked to melanoma - the deadliest skin cancer - that are not related to hair, skin or eye colour.
Genetics
Oct 09, 2011 |
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Scientists unravel the cause of rare genetic disease: Goldman-Favre Syndrome explained
A new research report published in The FASEB Journal will help ophthalmologists and scientists better understand a rare genetic disease that causes increased susceptibility to blue light, night blindness, and decreased vision ...
Medical research
Aug 31, 2011 |
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Newly identified gene mutation adds to melanoma risk
A major international study has identified a novel gene mutation that appears to increase the risk of both inherited and sporadic cases of malignant melanoma, the most deadly form of skin cancer. The identified mutation occurs ...
Cancer
Nov 13, 2011 |
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Pigment
A pigment is the material that changes the color of light it reflects as the result of selective color absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which the material itself emits light.
Many 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 ideal 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.
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 are used for coloring paint, ink, plastic, fabric, cosmetics, food and other materials. Most pigments used in manufacturing and the visual arts are dry colourants, usually ground into a fine powder. This powder is added to a vehicle (or matrix), a relatively neutral or colorless material that acts as a binder.
The worldwide market for inorganic, organic and special pigments had a total volume of around 7.4 million tons in 2006. Asia has the highest rate on a quantity basis followed by Europe and North America. In 2006, a turnover of 17.6 billion US$ (13 billion Euro) was reached mostly in Europe, followed by North America and Asia.
A distinction is usually made between a pigment, which is insoluble in the vehicle (resulting in a suspension), and a dye, which either is itself a liquid or is soluble in its vehicle (resulting in a solution). The term biological pigment is used for all colored substances independent of their solubility. A colorant can be both a pigment and a dye depending on the vehicle it is used in. 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.
For more information about Pigment, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
