FUEL COMPOSITIONS

摘要

Use of a Fischer-Tropsch derived fuel component, in a fuel composition, for the purpose of altering the spectroscopic response of the composition to the presence of a spectroscopically active indicator. The Fischer- Tropsch derived component may be used to increase the detectability of the indicator, and/or to increase the resolution of an analytical test subsequently carried out on the composition. Also provided is a method for investigating a property of a fuel composition, by adding a spectroscopically active indicator and detecting a subsequent spectroscopic response in the composition, wherein the composition contains a Fischer-Tropsch derived fuel component. Further provided is a fuel composition containing a spectroscopically active indicator and a Fischer-Tropsch derived fuel component. The spectroscopic response may be a visible response such as a colour change.