Indigo Lab Intro - cloth blue This type of dyeing is called...

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Indigo Lab
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Introduction The overall purpose of this lab is to create a sample of indigo dye and to use it to dye multiple pieces of material. Chemical synthesis, the process of making indigo, consists of using several reagents to create a certain molecule. Indigo’s insolubility in water makes it ineffective in the dyeing process. However, if it undergoes a chemical change, it can be used in the dyeing process. Using experimental and theoretical yields generates an overall percent yield for the experiment. Two different forms of indigo will be prepared in this lab: leucoindigo and indigo carmine. The first form of indigo, leucoindigo, is the product of indigo being oxidized by a reducing agent. Cloth is soaked in the leucoindigo, and then removed and dried. When drying the oxygen in the air oxidizes the leucoindigo back to indigo, which leaves the
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Unformatted text preview: cloth blue. This type of dyeing is called vat dyeing and is used mostly on cotton, wool and other fibers. Because leucoindigo is used commonly in vat dyeing, it is presumptuous that it will also be effective in the dyeing process of the pieces of cloth. There is a slightly different process in preparation involving the indigo carmine. The indigo is reacted with sulfuric acid, which in turn, allows it to be water-soluble. Depending on the concentration it is placed into, the indigo adds two, three, or four sulfuric acid units. Afterwards, a percent yield can then be found using spectrophotometric techniques. One common use for indigo carmine is Blue #2 dye. Indigo disulfonic acid is the expected product because it is the most commonly used form....
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