Scientists at the National Institutes of Health found that women who use permanent hair dye and chemical hair straighteners have a higher risk of developing breast cancer than women who don't use these products. The study ...
Dec 4, 2019
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A Columbia Engineering team has developed a technology that could replace conventional biopsies and histology with real-time imaging within the living body. Described in a new paper published today in Nature Biomedical Engineering, ...
Mar 28, 2022
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Hair dye manufacturers are on notice: The cure for gray hair is coming. That's right, the need to cover up one of the classic signs of aging with chemical pigments will be a thing of the past thanks to a team of European ...
May 3, 2013
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Simply eating healthier may improve the behavior of children with attention deficit hyperactivity disorder if therapy and medication fail, said a study published Monday in the journal Pediatrics.
Jan 9, 2012
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Scientific breakthroughs don't always happen in labs. For Sophia and Richard Lunt, Michigan State University researchers, many of their breakthroughs happen during neighborhood walks.
Oct 25, 2019
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Women who use permanent hair dye products to color their hair at home do not experience greater risk of most cancers or greater cancer related mortality, finds a study published by The BMJ today.
Sep 2, 2020
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A "team" of fast-moving, bone marrow stem cells from a research laboratory in Singapore has run away with the first World Cell Race, finishing first with a cellular speed record of 5.2 microns per minute (or 0.000204 inches ...
Dec 3, 2011
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(Phys.org)—A team of researchers with members from France, Korea and Germany has found that temperatures inside human mitochondria can run as high as 50°C. In their paper uploaded to the preprint server bioRxiv, the group ...
As a worldwide shortage of contrast dye for medical imaging continues, a new UC San Francisco research letter in JAMA quantified strategies medical facilities can employ to safely reduce dye use in computed tomography (CT) ...
Jun 10, 2022
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You and your dentist have a lot of tools and techniques for stopping cavities, but detecting the specific chemical conditions that can lead to cavities and then preventing them from ever getting started is much harder. Now, ...
Mar 8, 2022
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A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and requires a mordant to improve the fastness of the dye on the fiber.
Both dyes and pigments appear to be colored because they absorb some wavelengths of light more than others. In contrast with a dye, a pigment generally is insoluble, and has no affinity for the substrate. Some dyes can be precipitated with an inert salt to produce a lake pigment, and based on the salt used they could be aluminum lake, calcium lake or barium lake pigments.
Dyed flax fibers have been found in the Republic of Georgia dated back in a prehistoric cave to 36,000 BP. Archaeological evidence shows that, particularly in India and Phoenicia, dyeing has been widely carried out for over 5000 years. The dyes were obtained from animal, vegetable or mineral origin, with no or very little processing. By far the greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood, but only a few have ever been used on a commercial scale.
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