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Unformatted text preview: CHAPTER 22-ADDING COLOR TO TEXTILES DYES & PIGMENTS- Colorants: powerfully colored materials o Dyescolorants that are applied to OR formed in a textile substrate in molecularly dispersed form Must be soluble or capable of being made soluble in application so can penetrate into fiber Cross setion of dyed fiber typically shows color throught out o Pigmentscolortants in particulate form which is insoluble in a textile substrate, but whoch can be dispersed within substrate to odify its color Not moleculary dispersed BUT are small insoluble aggregate particles May be added to liquid stage of manufactured fiber spinning OR applied to surface of textiles materials & held there w/binder- Natural Dyes o Coloring results from interaction of functional grous within fibers & those within dyestuff and/or a fitting of dye & fiber molecules together o Mordants Substances (natural acids or oxides) that react with dyestuff to form colored lake (insoluble compound) thereby fixing color within & on fiber o Organic: Plant dyes From flowers, leaves, berries, barks, roots, lichens Indigo from woad plant Madder source of reds; useful quality of producing several diff colors or color intensities in combo with diff mordants Aluminum= pinks/bright reds Iron= purple/black Animal sources Cochinealred; from scale insects Tyrian purplemade from juice secreted from small shellfish o Dye is 1 st milked form shellfish o White liquid (as it oxidized) turns from milk white to green, to red, to deep purple o Expensive o royal purple o Inorganic Mineral colors iron buff, manganese bronze, chrome yellow, Prussian blue Apply two soluble salts that form colored precipitate w/in fabric- Synthetic Dyes o William perkin Coal-tar derived chemicals produced purple colored substance that dyes silk 1 st synthetic= Mauveine; reddish purple o Attractive because same app process could be used to dye whole range of colors vs. natural dyes requiring diff app tech DYES, DYING, AND THE SUPPLY CHAIN- Design & Color Selection o Color arise through interaction of an object, a light source, & an observer o **it is not a fixed property of an object** o How color is communicated clearly through SC: Specify light source under which color is seen CIE specified standard theoretical light sources Specify way object interacts with any lightsas opposed to its color under one light Done by measuring reflectance curve on spectrophotometer w/this, way the color changes as light changes can be predicted colors specified this way wont fade or get direct as real color sample might **2 methods combined in engineered color standards...
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This note was uploaded on 05/06/2010 for the course HUEC 2040 taught by Professor Staff during the Fall '08 term at LSU.
- Fall '08