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 |
5 / 5 (1) |
0
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 |
not rated yet |
2
|
Photoacoustics spares healthy lymph nodes in patients with metastasized cancer
If a tumour has spread through the lymph nodes, the decision is often taken to exercise caution and remove extra tissue, to prevent it from spreading further. This often involves the removal of healthy lymph ...
Cancer
Apr 18, 2013 |
not rated yet |
0
AAD: Complications of tattoos and tattoo ink discussed
(HealthDay)—Complications linked to tattoos and tattoo inks include allergic reactions, serious infections, and reactions that can be mistaken for skin cancer, according to information presented at the ...
Diseases, Conditions, Syndromes
Mar 01, 2013 |
not rated yet |
0
Colour vision link may help myopia research
(Medical Xpress)—A possible link between colour vision and the development of myopia - or near-sightedness - has been discovered by an international group, including a researcher from The University of Western Australia.
Ophthalmology
Mar 01, 2013 |
not rated yet |
0
|
Modified protein could become first effective treatment for vitiligo
Loyola University Chicago Stritch School of Medicine researchers have developed a genetically modified protein that dramatically reverses the skin disorder vitiligo in mice, and has similar effects on immune ...
Medical research
Feb 27, 2013 |
5 / 5 (1) |
0
|
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 |
4 / 5 (1) |
2
Research finds protein that prevents light-induced retinal degeneration
Research led by Minghao Jin, PhD, Assistant Professor of Ophthalmology and Neuroscience at the LSU Health Sciences Center New Orleans Neuroscience Center of Excellence, has found a protein that protects retinal photoreceptor ...
Neuroscience
Feb 12, 2013 |
5 / 5 (2) |
0
|
Want to get rid of that old tattoo? You're not alone
(HealthDay)—It seems that tattoos are everywhere these days, but along with the increase in people getting inked, the number of Americans undergoing procedures to have a tattoo removed is also on the rise, ...
Health
Feb 09, 2013 |
not rated yet |
1
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 |
4.3 / 5 (3) |
0
|
Specific protein essential for healthy eyes, study finds
Researchers at the Hebrew University of Jerusalem, in collaboration with researchers at the Salk Institute in California, have found for the first time that a specific protein is essential not only for maintaining a healthy ...
Neuroscience
Jan 07, 2013 |
5 / 5 (1) |
0
Better approach to treating deadly melanoma identified by scientists
(Medical Xpress)—Researchers funded by Cancer Research UK have been looking at why new drugs called "MEK inhibitors", which are currently being tested in clinical trials, aren't as effective at killing cancer cells as they ...
Cancer
Dec 19, 2012 |
not rated yet |
0
|
Keep tots' milk to two cups a day, study says
(HealthDay)—Drinking two cups of milk a day gives toddlers adequate amounts of vitamin D without lowering their iron levels, according to new research.
Pediatrics
Dec 17, 2012 |
not rated yet |
0
|
Study is first to find significant link between sleepiness and vitamin D
A new study suggests that there is a significant correlation between excessive daytime sleepiness and vitamin D, and race plays an important factor.
Health
Dec 14, 2012 |
4.3 / 5 (4) |
1
|
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 |
4.6 / 5 (11) |
0
|
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.
