ASTM D6045 Color of Petroleum Products by the Automatic Tristimulus Method
10. Procedure
10.1 Calibration - Prepare the spectrophotometer or tristimulus filter colorimeter for operation following the manufacturer's instructions.
10.1.1 Periodic measurement of suitable Test Method D1500 or Test Method D156, or both, comparative samples would verify instrumental performance. Refer to the manufacturer's documentation for specific details. A method for creating suitable samples is included in Appendix X1.
10.1.2 Basic calibration procedures are given in Appendix X2.
10.2 Measurement - Place the cell filled with the sample in the instrument, and measure according to the manufacturer's instructions.
10.3 Record the ASTM color value or Saybolt number as appropriate.
