![]() conjugated double bonds) exist in the same molecule. Even less energy required for this transition if alternate single and double bonds (i.e. It is a n electron (an electron in a double or triple bond) that is promoted to the excited state. Particular excitation energies correspond to particular wavelengths of visible light. The molecule is said to have undergone an electronic transition during this excitation process. The absorption of visible light energy by the compound promotes electrons in the molecule from a low energy state, the ground state, to a higher energy state, the excited state. It became particularly popular when Queen Victoria wore a silk gown dyed with mauveine at the Royal Exhibition of 1862 in London.īy kind permission of the Society of Dyers and Colourists. It was produced accidentally by William Perkin in 1856 who was trying to synthesize quinine. The light that is transmitted is seen by the observer and appears coloured because some of the wavelengths of the visible spectrum are now missing.įigure 1 Mauveine was the first ever synthetic dye. This section considers some of the chemistry behind the colour of dyes and how the target material, for example a fibre, influences the method of dyeing and the dye used.Ī dye in solution is coloured because of the selective absorption of certain wavelengths of light by specific bonds in the molecule. Manipulating the colour and application of dyes Most pigments used are also organic compounds. They are applied by using a dispersion in a suitable medium. Pigments are insoluble compounds used in paints, printing inks, ceramics and plastics. They are designed to bond strongly to the polymer molecules that make up the textile fibre. Dyes are soluble coloured organic compounds that are usually applied to textiles from a solution in water. Colorants are also now being used in novel applications and are termed functional (high technology) as they are not just included in the product for aesthetic reasons but for specific purposes, for example in surgery.Ĭolorants can be either dyes or pigments. ![]() The most frequently produced items are: edge colored wedding invitations, edge colored business cards, edge colored note cards, and edge colored invitations.Colorants are used in many industries - to colour clothes, paints, plastics, photographs, prints, and ceramics. For other printers wanting to use this service coated papers do not work please do not trim the cards, a very fresh cutter blade with exceptionally precise trimming is needed chop cuts between positions is not acceptable, a 1/4" retrim between card positions is needed. We edge color for many other printing firms. The larger the size of the bleed off element, the greater the chance that the edge coloring will seep into the cards face and back.Ĭards that cannot be stacked perfectly flush, such as those printed with thermography, or embossed then duplexed, cannnot be edge colored.īlack papers edge color the best, when using a metallic color. Only the tiniest of letterpress or foil stamping bleed content can be used with edge colored pieces. ![]() Thicker cards show off the edge coloring better than a thinner card will. It is not recommended to edge color different paper colors in the same project with the same edge color. The edge color will have a different hue and color cast on different paper colors. Our metallic edge coloring is very nice, but it is not gilding or a foil. All edge coloring colors are mixed by eye, therefore only an 85% to 90% color match can be achieved. The dyes used for edge coloring do not have a Pantone license, so there is no set formula for color mixing. Colors are chosen from the Pantone Solid Uncoated, Neon or Metallic swatch books.
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