Discoloration of spa or pool surfaces most often caused by metal corrosion of circulation system due to low pH Sequestering or chelating agent will remove stains, for tough stains acid wash may be necessary
A discoloration or a colored deposit on the walls or bottom of a swimming pool or spa Most often, stains are metals, such as iron, copper & manganese They may appear as green, gray, brown or black They may even discolor the water Sometimes a sequestering agent or chelating agent will remove them If not, us- ually an acid wash is necessary to remove them from the walls & bottom The metals get in the water because the pH was too low or someone has added a low-pH chemical directly into the circulation system The low-pH chem- ical dissolves a small amount of metal from the equipment The metals begin to come out of solutions & deposit or stain the walls & bottom Stains are sometimes confused with scale
To color, as wood, glass, paper, cloth, or the like, by processess affecting, chemically or otherwise, the material itself; to tinge with a color or colors combining with, or penetrating, the substance; to dye; as, to stain wood with acids, colored washes, paint rubbed in, etc
If a liquid stains something, the thing becomes coloured or marked by the liquid. Some foods can stain the teeth, as of course can smoking. + stained stained His clothing was stained with mud. + -stained -stained ink-stained fingers
a soiled or discolored appearance; "the wine left a dark stain" (microscopy) a dye or other coloring material that is used in microscopy to make structures visible color for microscopic study; "The laboratory worker dyed the specimen" color with a liquid dye or tint; "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages" produce or leave stains; "Red wine stains the table cloth
A stain is a mark on something that is difficult to remove. Remove stains by soaking in a mild solution of bleach. a black stain
- A liquid mixture to color wood Made of 4 parts: Vehicle (water or solvent), Colorant (pigments and dyes), Binder (resin), Additives (solvents to control drying)
A compound added to glazes to add coloring Sometimes applied directly onto a clay body without mixing with a vitrifying glaze See also glaze, vitrification
Sometimes a single coloring oxide, but usually a combination of oxides, plus alumina, flint, and a fluxing compound This mixture is calcined and then finely ground and washed The purpose is to form a stable coloring agent not likely to be altered by the action of the glaze or heat While stains are employed as glaze colorants, their chief use is as overglaze and underglaze decorations and body colorants
A translucent finish for wood that can be clear or tinted, allowing the grain and figure of the wood to show through the finish Stains do not provide the same level of protection afforded by a varnish or paint finish
make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
(Tıp, İlaç) Feulgen stain is a staining technique discovered by Robert Feulgen and used in histology to identify chromosomal material or DNA in cell specimens. It depends on acid hydrolysis of DNA, therefore fixating agents using strong acids should be avoided
Staining technique for the initial identification of bacteria, devised in 1884 by the Danish physician Hans Christian Gram (1853-1938). The stain reveals basic differences in the biochemical and structural properties of a living cell. A slide containing a smear of bacteria is treated with a purple dye; the slide is then dipped in an iodine solution, followed by an organic solvent (such as alcohol) that can dissolve the dye. Gram-positive bacteria remain purple because they have a thick cell wall that the solvent cannot easily penetrate; gram-negative bacteria lose their colour because they have thin cell walls that allow the solvent to penetrate and remove the dye
Staining is a technique particularly associated with acrylics It is carried out on unprimed cloth, where the colour penetrates the fabric and creates a stain Pigments that penetrate the ground becoming difficult to remove are called staining colours
[ 'stAn ] (verb.) 14th century. From Middle English steinen, steynen (“to stain, colour, paint”), of North Germanic origin, from Old Norse steina (“to stain, colour, paint”), from steinn (“stone, mineral blee, colour, stain”), from Proto-Germanic *stainaz (“stone”), from Proto-Indo-European *stAy- (“stone”). Cognate with Old English stān (“stone”). More at stone. In some senses, influenced by unrelated Middle English disteynen (“to discolor, remove the colour from"; literally, "de-colour”), from Anglo-Norman desteindre (“to remove the colour from, bleach”), from Old French desteindre (“to remove the color from, bleach”) from des- (“dis-, de-, un-”) + teindre (“to dye”), from Latin tingo.
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