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The primary test used to measure the chemicals in both green and white liquor is a titration test called the ABC test. A B C are the names given to the three end points in the titrations. The test is conducted in a laboratory under controlled conditions, and provides information about the concentration of cooking chemicals in the green and white liquors. Another test that is conducted is the density measurement of the liquors. This is sometimes reported as specific gravity, the ratio of liquor density to water density. These tests monitor the recausticizing reaction or the conversion of green liquor to white liquor. The concentration of cooking chemicals in white liquor is used to determine the flow of white liquor sent to or charged to the digesters.