can sawdust be used in making dyes?
114857
Yes. Do a Google search on tannin dyes.
908520
No, it will not make you sick. Your skin may absorb some f the dye but it won't harm you. They're supposed to be non-toxic.
83760
This website has a nice step by step explanation of how to make dye using plants:\nhttp://www.pioneerthinking.com/naturaldyes.html\nThis site has a listing of common plants that can be used for dye and a more detailed explanation of how to make the dye.\nhttp://www.kidsgardening.com/growingideas/projects/may03/pg1.html\nHope this is helpful :-)
739413
In general, dyes can be considered normal chemicals. Try looking into processing some chemicals that you are familiar with, for example ethanol, bleach, vinegar (acetic acid), etc.
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Potassium permanganate (KMnO4) stains fabrics, fingers, and paper a dark brown color. The coffee-colored stains often can't be scrubbed off, and they may persist until the outer layer of stained skin wears off (in a day or two). It's more than just a nuisance for students and laboratory workers. Municipal water supplies are sometimes overtreated with permanganate ion to kill microbes and parasites, and when that water is chlorinated, swimming pools and porcelain can be badly stained.\nPermanganate itself is a deep purple color (almost black). The brown stain develops when permanganate decomposes into crystalline manganese dioxide on the skin or fabric surface:\n\n4 MnO4-(aq) + 4 H+(aq) = 3 O2(g) + 2 H2O() + 4 MnO2(s)\n\nThe tiny crystals of MnO2 become trapped in the pores and complex surfaces of the skin. The crystals are insoluble, and washing with water will only dislodge a few loose crystals. If the stain is on a nonliving surface, try treating it with a weak hydrochloric acid solution. Hydrochloric acid can reduce the MnO2 to water-soluble Mn2+:\n\nMnO2(s) + 4 HCl(aq) = MnCl2(aq) + Cl2(aq) + 2 H2O()\n\nCuriously, permanganate's oxidizing power makes it very useful for removing stains. Permanganate oxidation breaks the molecules of large, highly colored substances into smaller pieces. The excess permanganate is then removed chemically or by quickly rinsing.\n\nFor example, book collectors remove stains from old paper by washing the paper with a weak solution of permanganate; a rinse of sulfurous acid is used to remove the permanganate before it locks into the paper fibers and turns it brown. The same trick can be used to remove indelible inks from concrete. Photographers use permanganate to bleach stains caused by certain developing chemicals.\n\nHope that helps!!!
1010725
i'm doing it on the factors affecting the solidification of gelatine.\nwas going to do it on contents of dyes.
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Nothing, some cultures actually use plant pigments to dye fabrics.  The skins from red onions can be used to dye fabrics or to make colourful easter eggs, you just need to extract the pigments from the plants first by boiling the plant matter to break open the cells and release the pigment.\nHope this helps
505634
Go to \n\nhttp://dyesubinks.com/index.php?pageto=printers.htm\n\nIt should answer your question.
918686
Ingesting Red Dye #2 (banned by the FDA since 1976)
986816
Was the dye the same brand as before. It may have been contaminated.
1032219
Well, if you were capable, you could possibly extract or distill the dye from a jug of antifreeze.\n\nBut there aren't any common household chemicals you could mix up in the sink to make a green fluorescent dye.
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A dye is a molecule or chemical which absorbs light more at some visible \nwavelengths than at others.\nAdded to a clear medium, it gives clear colors.  Transparent, not even \nmilky or translucent.\nAdded to an opaque medium such as concrete, the opacity remains, some \ncolor is added,\nand the net gray-equivalent brightness is always reduced, because a dye \ncan only absorb light.\n\nA pigment is a mixture of dye and an opacifying agent,\nsuch as white oxide powders which scatter light or dark colored powders \nwhich both absorb and scatter.\nSo the colors they add are opaque; i.e. it looks more like paint, \nregardless of whether the original medium was clear or opaque.\nA white or light-colored pigment can sometimes make a dark medium lighter, \nprovided\nthe original medium was more translucent than the pigment.\n\nThis translucency can be quantified.  Virtually every opaque material \nbecomes transparent or translucent if sliced thin enough.\nFor light-scattering materials, the thickness which deflects 63% of the \nlight can be called the "scattering length".\nIn effect, this is about the minimum thickness which would fuzz-up your \nview and stop you from reading a newspaper through it,\nif held a certain distance above the paper.\nAdding enough white or silver or black powder to a medium shortens the \nscattering length.\nThis enables light-colored pigments to seize control of the color of \nmedium-gray concrete and make it white or light colors.\nA pure dye could never do that, could only make the gray into dark or \nperhaps medium colors.\n\nTextiles already have plenty of scattering for their uses, so to color \nthem all you need is dye.\nAdding powder would not endure anyway; it would soon wash out, causing the \ncolor you added to change.\n\nIn the field of resins for fiberglass lamination or casting, the words are \nused interchangeably,\neven though some color additives are clear and others have opacifying \nagents in them.\nI find this unfortunate.\n\nThe freeware 3-D photo-realistic rendering software "POV-Ray" uses the \nword "pigment"\nto label a collection of color properties which can be applied to a surface.\nI don't yet understand exactly which properties they allow their term to \ninclude,\nbut it's probably more complex than just colored absorption, and results \nin some opacity.\nI find learning to use POV-Ray "visually educating".\n\nMany dye additives, as delivered, are so concentrated and absorbing that \nthey have a color-tinged black appearance.\nbut if you spread one drop thinly over a surface you could read fine print \nthrough it.\nFood coloring is a water-soluble example of what I would call dye.\n\nA tube of white toothpaste would be a white pigment for some imaginary use.\nThe same toothpaste, with a red dye added, would be a pink or red pigment.\nWith an overwhelming concentration of dyes, or with black powder added, it \ncould be a black pigment.\nSilver or metallic colorants can only be pigment.\n\n"Stain" tends to mean a dye with selective uptake: some parts of the \nstained object get darker than others by retaining more of the colorant.\nWood stains intensify the visibility of the wood's grain; biological \nstains selectively color certain substances for viewing in the microscope.
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See if these answer your question.\n\nhttp://www.finishing.com/Library/flux.html\n\nwww.residues.com/pdfs/woa_flux_residue.pdf\n\nhttp://smt.pennnet.com/Articles/Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=83118
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GRASSES OF USE\n\nThe strength and flexibility of grasses and even some reeds finds application in weaving. Mats and baskets can be made from them. The Pattamadam pai is made from korai grass. African tribals wear grass skirts.\n\nBamboo and sugar cane are giant grasses. Bamboo regenerates quickly and the hard stems are a cheap and convenient resource for making furniture, baskets and screens. Bamboo stems are edible and the material of which flutes are made. After extraction of sugar, the crushed stems of the sugar cane, known as bagasse, are used in making paper.
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A dye can generally be described as a colored substance that has an affinity to the substrate to which it is being applied. The dye is usually used as an aqueous solution, and may require a mordant to improve the fastness of the dye on the fiber. In contrast, a pigment generally has no affinity for the substrate, and is insoluble.\n\nArchaeological evidence shows that, particularly in India and the Middle East, dyeing has been carried out for over 5000 years. The dyes were obtained from either 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.\n\nOrganic dyes\nThe first man-made organic dye, mauveine, was discovered by William Henry Perkin in 1856. Many thousands of dyes have since been prepared and, because of vastly improved properties imparted upon the dyed materials, quickly replaced the traditional natural dyes. Dyes are now classified according to how they are used in the dyeing process.\n\nAcid dyes are water-soluble anionic dyes that are applied to fibers such as silk, wool, nylon and modified acrylic fibers using neutral to acid dyebaths. Attachment to the fiber is attributed, at least partly, to salt formation between anionic groups in the dyes and cationic groups in the fiber. Acid dyes are not substantive to cellulosic fibers.\n\nBasic dyes are water-soluble cationic dyes that are mainly applied to acrylic fibers, but find some use for wool and silk. Usually acetic acid is added to the dyebath to help the uptake of the dye onto the fiber. Basic dyes are also used in the coloration of paper.\n\nDirect or substantive dyeing is normally carried out in a neutral or slightly alkaline dyebath, at or near boiling point, with the addition of either sodium chloride (NaCl) or sodium sulfate (Na2SO4). Direct dyes are used on cotton, paper, leather, wool, silk and nylon. They are also used as pH indicators and as biological stains.\n\nMordant dyes require a mordant, which improves the fastness of the dye against water, light and perspiration. The choice of mordant is very important as different mordants can change the final colour significantly. Most natural dyes are mordant dyes and there is therefore a large literature base describing dyeing techniques. The most important mordant dyes are the synthetic mordant dyes, or chrome dyes, used for wool; these comprise some 30% of dyes used for wool, and are especially useful for black and navy shades. The mordant, potassium dichromate, is applied as an after-treatment.\n\nLook up leuco form in Wiktionary, the free dictionary.Vat dyes are essentially insoluble in water and incapable of dyeing fibres directly. However, reduction in alkaline liquor produces the water soluble alkali metal salt of the dye, which, in this leuco form, has an affinity for the textile fibre. Subsequent oxidation reforms the original insoluble dye.\n\nReactive dyes utilize a chromophore containing a substituent that is capable of directly reacting with the fibre substrate. The covalent bonds that attach reactive dye to natural fibers make it among the most permanent of dyes. "Cold" reactive dyes, such as Procion MX, Cibacron F, and Drimarene K, are very easy to use because the dye can be applied at room temperature. Reactive dye is by far the best choice for dyeing cotton and other cellulose fibers at home or in the art studio.\n\nDisperse dyes were originally developed for the dyeing of cellulose acetate, and are substantially water insoluble. The dyes are finely ground in the presence of a dispersing agent and then sold as a paste, or spray-dried and sold as a powder. They can also be used to dye nylon, triacetate, polyester and acrylic fibres. In some cases, a dyeing temperature of 130 °C is required, and a pressurised dyebath is used. The very fine particle size gives a large surface area that aids diss
984892
Paper mache? Cut an opening and fill it with clay to form shapes for organelles??
813350
Yes!\n\nMost are removed by dissolving them in the detergent, etc. The detergent is the solvent the stain the solute. \n\nAlthough water is the universal solvent it sometimes needs help. The detergent, in a sense, makes water wetter breaking down its adhesion to each other leaving more water to attach to the dirt. \n\nDry cleaning is not 'dry' it is wet, just not with water. \n\nYou need to use the solvent that will dissolve your stain the best.