An important part of the refining procedure is colour measurement. Colour is an indication of type and quality. In some cases it used as a means of recognition as is such with aviation fuel and ships diesel fuel. Other petroleum products are required to be colourless such as food quality waxes.
Acid Wash Test (ASTM D848)
Lovibond® RYBN Colour
Anti-Icing in Aviation Fuels
Optical density
ASTM Colour (ASTM D 1500, ASTM D 6045, ISO 2049, IP196)
Quinazarin Warehouse Kit
Carbonisable Substances (Insolubles)
Quinizarin (Marked Oils)
CIE L*a*b
Saybolt Colour (ASTM D 156, ASTM 6045)
Delta E* colour difference
Spectral data
Dyed Aviation Gasoline (ASTM D 2392)
xyY chromaticity co-ordinates
Euromarker
XYZ tristimulus values
Iodine Colour (DIN 6162)
Lead in Aviation Fuels
IP Units (IP 17Method B)
Platinum-Cobalt/Hazen/APHA Colour (ASTM D 1209)
