ISO 2049:1996

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ISO 2049:1996 refers to an International Standard published by the International Organization for Standardization (ISO) that specifies a method for visually determining the color of various petroleum products, like lubricating oils, heating fuels, diesel fuels, and petroleum waxes, using the ASTM color scale; essentially, it's a standardized way to describe the color of these products based on a visual comparison to reference color samples