ASTM D7058 Standard Test Method for Determination of the Red Dye Concentration and Estimation of Saybolt Color of Aviation Turbine Fuels and Kerosine Using a Portable Visible Spectrophotometer
11. Procedure
11.1 Prepare the spectrophotometer for operation in accordance with the manufacturer's instructions.
11.2 Equilibrate the sample to between 20 and 25°C.
11.3 Fill a clean, dry, sample cell. The external optical surfaces must be clean. If not, wipe clean, and dry with a piece of lint free paper (for example, lens paper).
11.4 Insert the sample cell into the cell chamber of the instrument.
11.5 Record the Solvent Red 26 equivalent concentration and the estimated Saybolt color.
