ISO 2049 Petroleum products - Determination of colour (ASTM scale)
1 Scope
This International Standard specifies a method for the visual determination of the colour of a variety of Petroleum products, such as lubricating oils, heating fuels, diese1 fuels and Petroleum waxes. lt is limited to products that do not contain artificial dyes.
2 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 3015: 1992, Petroleum products - Determination of cloud point.
ISO 3016: 1994, Petroleum products - Determination of pour point.
ISO 3696: 1987, Water for analytical laboratory use - Specification and test methods.
ISO 6271: Clear liquids - Estimation of colour by the platinum-cobalt scale.
ISO 6353-2: 1983, Reagents for Chemical analysis - Part 2: Specifications - First series.
3 Principle
A test Portion of the Petroleum product is viewed under an artificial daylight Source and the colour compared with a number of Standard colour glasses. The matthing colour Standard, or that closest to it on the darker side, is recorded as the colour value. If the colour is darker than the darkest Standard, dilution with a specified solvent tan be applied to permit matching.
