Search results
Results From The WOW.Com Content Network
The presence of pigment discoloration, stains and the formation of bio-film are indicative of chemical degradation. Given the variety of organic and inorganic molecules present in frescoes, many type of micro-organisms may grow on the substrate of the fresco provided that environmental conditions (humidity, temperature, light, and pH) are ...
Pastels that are made of pigment particles bound together with a binding agent, and oil pastels that have pigments mixed with wax and non-drying oil. Pastels that are pigment particles bound together take on a more chalky and loose powdery characterization, and are secured to its supports using fixative or diluted resin in solution.
The discolored skin is caused by excessive deposits of melanin (normal skin pigment). Most newborns with IP will develop discolored skin within the first two weeks. The pigmentation involves the trunk and extremities, is slate-grey, blue or brown, and is distributed in irregular marbled or wavy lines. The discoloration sometimes fades with age.
There are a wide range of depigmenting treatments used for hyperpigmentation conditions, and responses to most are variable. [11]Most often treatment of hyperpigmentation caused by melanin overproduction (such as melasma, acne scarring, liver spots) includes the use of topical depigmenting agents, which vary in their efficacy and safety, as well as in prescription rules.
This results in either the entire surface (if all pigment cells fail to develop) or patches of body surface (if only a subset are defective) having a lack of cells that can make pigment. Since all pigment cell-types differentiate from the same multipotent precursor cell-type, leucism can cause the reduction in all types of pigment.
There were many reasons for the creation of illuminated manuscripts, and these varied with each commission. However, the most common were either for teaching purposes or as shows of wealth. Because most common people were illiterate, they could only relate to stories of church doctrine through pictures rather than reading the words.
These lightweight, derm-loved best body serum formulas target every skin concern from the neck down. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways ...
Skin pigmentation is frequently caused by sun exposure. To protect itself against UV radiation from the sun, the body makes more melanin. As a result, the skin may become more pigmented to protect it from the sun's rays. [4] The pigmentation of the skin may also be lightened by certain drugs.