ISO 2049 Petroleum products - Determination of colour (ASTM scale)
4 Reagents and materials
4.1 Water, complying with the requirements of Grade 3 of ISO 3696 and colour no greater than 10 units (Hazen) in accordance with ISO 6271.
4.2 Kerosine, lighter in colour than a potassium dichromate (K2Cr2O7) solution formed by dissolving 4.8 mg of pure anhydrous potassium dichromate, as specified in ISO 6353-2, in 1 litre of water (4.1).
5 Apparatus
5.1 Colorimeter, consisting of a light source, glass colour standards, sample container housing with cover and viewing piece, conforming to one of the designs described in annex A.
5.2 Sample container, of clear colourless glass. For referee tests, use the glass sample jar shown in figure 1. For routine tests, it is permissible to use a glass jar such as is used for the cloud point and pour point tests, in accordance with ISO 3015 and ISO 3016 respectively, i.e. a cylindrical jar with a flat bottom of 30 mm to 32.4 mm internal diameter, 115 mm to 125 mm external height, and a wall thickness no greater than 1.6 mm.
5.3 Sample cover, of any suitable material that is dull black on the inside and is designed to completely shield the containers as described in 7.2.
