2. Experimental method2.1 color extraction from Roselle with solvent (water).2.1.1 use dried Roselle red to spin fine powder. Then the powder mass okra 100 g. To bite with solvent. The total volume 600, ml. At 95 C, then filtered through a cloth, and do a number of 3 times.The color 2.1.2 extracted. To detect the wavelength, and the ability to absorb light with Ultraviolet Visible Spectrometer.2.2 mixing stage by screen printing ink color extraction.2.2.1 ingredients in making ink, there is 4 main component.2.2.1.1 primary colors. Is the color from the extraction procedure 1.2.2.1.2 bracket mounted on the printed material substance use Thickener type, which actually used in industry is Sodium Alginate.2.2.1.3 solvent bracket of here, means using distilled water.2.2.1.4 additive to maintain the balance of printing ink;Urea - moisture absorption, help in the flow of ink while typing sodium bicarbonate to adjust the ink as a base.2.2.2 the optimum formula of mixture. Percentage by weight into the mixture 2 main parts and Stock paste Print paste.The ratio is.
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