ASTM D156 for Saybolt color of petroleum products (Saybolt Chromometer method)
12. Report
12.1 Report the recorded color units as "Saybolt color_____________". When the sample has been filtered, add the words "(sample filtered)".
13. Precision and Bias
13.1 The precision of this test is not known to have been obtained in accordance with currently accepted guidelines.
13.2 The precision of this test method as obtained by statistical examination of interlaboratory test results is as follows:
13.2.1 Repeatability - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following value only in one case in twenty:
1 color unit
13.2.2 Reproducibility - The difference between two single and independent test results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method exceed the following value only in one case in twenty:
2 color units
13.3 Bias - The procedure in this test method has no bias because the value of Saybolt Color is subjective and can only be defined in terms of this test method.
14. Keywords
14.1 aviation gasoline; color; jet fuel; kerosine; motor gasoline; oils; petroleum wax; Saybolt Color; white oils
