2. Experimental method
2.1. Extraction with solvent paint from Roselle (distilled water)
2.1.1. Use of dried okra with red to spin fine powder. Then the powder mass okra 100 g. To bite with a solvent to the total volume 600 ml.At 95 C, then filtered through a cloth, and do a number of 3 times
2.1.2 bring color extract. To detect the wavelength, and the ability to absorb light with Ultraviolet Visible Spectrometer
2.2 mixing stage by screen printing ink color extracted
2.2.1 ingredients in making ink, there is 4 main component is
2.2.1.1 primary color is the color of the extraction from the stage. 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 substance. This means using distilled water, 2.2.1.4
Additive to maintain the balance of the printing ink, including
.Urea - moisture absorption, help in the flow of ink while typing sodium bicarbonate to adjust the ink as a bass
2.2.2. The optimum formula of mixture. Percentage by weight into the mixture 2 main parts and Stock paste Print paste
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