3Post - Santiago Rubio Robin Kirkman Experiment 3:...

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Santiago Rubio Robin Kirkman Experiment 3: Bleaching: Action of NaOCl and H 2 O 2 on Scoured Cotton Fabric September 9, 2010 I. Part 2 A. Observations: 1. The hypochlorite bleached fabric was whiter than the peroxide bleached fabric. 2. The hypochlorite bleached fabric had a white index of 74.17 and the peroxide bleached fabric had a white index of 58.70. 3. Before we did the experiment we also measured the whiteness of the greige, desized, and scoured fabric. Their whiteness index was 2.71, 14.76, and 48.55 respectively. 4. The greige fabric was yellowish/beige in color, had many motes, and was had a starch size which contributed to its very low whiteness index. 5. As the fabric preparation went from the greige fabric to the bleached fabric, the whiteness index increased in every single process (desizing, scouring, and bleaching). 6. Theoretically, out whiteness index for the peroxide bleaching had to be somewhere between 72.00 and 80.00. However it was really low at 58.70. B. Calculations: 1. No required calculations. C. Results and Observations: 1. The first part of the experiment was to create a peroxide bleach bath. Before the scoured fabric was placed in the bath, its whiteness index was measured at 48.55. The purpose of bleaching is to remove any final impurities the fabric
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3Post - Santiago Rubio Robin Kirkman Experiment 3:...

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