Heat A to 60'C with slow stirring until the carbamide is completely dissolved. Avoid aeration of the detergent solution. Maintain the temperature at 60'C. In a separate container add sufficient 50% Citric Acid solution to neutralize the amide (pH 7). then add to A with slow stirring. Stir until temperature reaches 40'C and then add C. Stop stirring to allow entrapped air to escape. Higher viscosity can be achieved by the addition of small amounts of sodium chloride, as a 50% solution. Fill off at room temperature.
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