1.1 Two methods are prescribed for the determination of colour of practi-cally all petroleum products (dyed or undyed) except black oils; solid pro-ducts such as petrolatum and waxes are tested in the molten state. The colour of the material is determined by comparison with either (a) a series of red, yellow, and blue standard colour glasses as in Method A or (b) IP standard colour glasses as in Method B. The IP standard colour glasses are used only for determining the colour of refined undyed motor fuel, white spirit, oikerosine In an 18-in cell.
1.2 With the first series of glasses, the instrument functions as a trichromatic colorimeter, and may be used to measure the tint and depth of colour in Lovibond units, while, with the second series of glasses, the colour is expressed in terms of a restricted range of units peculiar to the petroleum industry.
IS 1448 Pt.13-1960 history
1962IS 1448 Pt.13-1960 Test methods for petroleum and its products [P: 13] LOVIBOND TINTOMETER color measurement