Direct match spectrographic determination of fuel properties

An apparatus for direct match comparison, the apparatus comprising a spectrographic analyzer capable of receiving a property value of a first refinery product using a non-spectrographic test;

• determining a property value of the first refinery product using spectrographically determined data stored in a spectral library;
• determining a property value of a second refinery product;
• determining a difference between the spectrographically-determined property values of the first refinery product and the second refinery product;
• and adding the difference to the non-spectrographically-determined property value of the first refinery product to derive a property value for the second refinery product.

A system for direct match comparison, the system comprising:

• a spectrographic analyzer capable of determining a property value of a test refinery product;
• and
• a computer programmed to receive a property value of a reference refinery product, the property value determined using a non-spectrographic test;
• receive a property values of the reference refinery product from data stored in a spectral library;
• receive said property value of the test refinery product determined by the spectrographic analyzer;
• determine a difference between the spectrographically-determined property values of the test refinery product and the reference refinery product;
• and add the difference to the non-spectrographically-determined property value of the reference refinery product to derive a property value for the test refinery product.