pigmentary epithelium, pigmented epithelium. that made of cells containing granules of pigment. posterior epithelium. the single layer of epithelial cells on the back of the cornea, between stroma and aqueous humour; the corneal endothelium.retinal pigment epithelium. see retina.sense epithelium, sensory epithelium. see neuroepithelium (1).he single layer of epithelial cells on the back of the cornea, between stroma and aqueous humour; the corneal endothelium. retinal pigment epithelium. see retina. sense epithelium, sensory epithelium. see neuroepithelium (1).
Since at least the mid-19th century, doctors have known that silver or silver compounds can cause some areas of the skin and other body tissues to turn grey or blue-grey. Argyria occurs in people who ingest or inhale
Annealing marking is when an oxide layer is created on ferrous metals (iron, steel, high-grade steel) and titanium through localized heating.Generally, the oxide layer is black, but it can also have other annealing colors (such as yellow, red and green).The color depends on the temperature of the heated layers.The material surface remains even during annealing because nothing is removed from it; the color change is achieved through localized material heating only.The heat usually penetrates 20 to 30 Âµm deep in the metal surface.he material surface remains even during annealing because nothing is removed from it; the color change is achieved through localized material heating only. The heat usually penetrates 20 to 30 Âµm deep in the metal surface.