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Noun. 1. tan-a browning of the skin resulting from exposure to the rays of the sun. sunburn, suntan, burn. hyperpigmentation-unusual darkening of the skin.
total acid number (tan) test ASTM D644 & ASTM D974 is the test method which we are using for monitoring the degradation acid content of in-service oil or used oil. The acid number test is performed by diluting the sample with a mixed solvent in a reaction beaker.