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P-C-111 C <br /> 4.5. 19. 1 Preparation of soil control compound. Combine solution K with <br /> solution L and mix thoroughly. Avoid skin contact. This compound is used <br /> in selecting valid test pistons. Mix 1 part of the compound with 3 parts <br /> distilled water for use in the cleaning tests . <br /> Solution K: <br /> *KOH (85 percent assay) 5.4 g• <br /> H2O (distilled) 6.0 g. <br /> Solution L: <br /> Cresol (U.S.P.) 65.2 ml . <br /> Oleic acid (technical) 25.0 ml . <br /> *If lower assay is used, calculate equivalent KOH content. Do not use less <br /> than 83 percent assay. Z <br /> 4.5. 19.2 Preparation of comparison formula. Prepare the comparison carbon <br /> removing compound as specified in table II . Mix all ingredients together <br /> except the sodium silicate solution. Stir the mixture into the sodium sili- <br /> cate solution. Caution: Us,e goggles and avoid skin contact. <br /> f <br /> i <br /> i <br /> 17 <br />