"ISO 6618:1997/Cor 1:1999" refers to an International Standard published by the International Organization for Standardization (ISO) that outlines a method for determining the acid or base number of petroleum products and lubricants using a color-indicator titration method, with the "Cor 1:1999" part indicating a technical corrigendum (correction) issued in 1999 to the original standard published in 1997.
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