FED-STD-791D
6. PROCEDURE
6.1 Clean the optical surfaces of the color comparator.
6.2 Insert empty tubes in the color comparator, and adjust the position of the light source
until the intensities of the light from both halves of the comparator split-field are equal.
6.3 Rinse and fill one of the tubes with reference liquid, and insert the plunger.
6.4 Wipe all excess reference liquid from the outside of the tube and from the top of the
plunger, and insert the tube in the one side of the comparator.
6.5 Rinse and fill the remaining tube with the sample and insert the plunger.
6.6 Wipe all excess sample from the outside of the tube and from the top of the plunger,
and insert the tube in the other side of the comparator.
6.7 Insert the color standard(s) into the comparator, and rotate the standard until the
color selection can be viewed by transmitted light.
6.8 Turn on the light source, and visually compare the two fields for hue and intensity.
(When testing aviation gasoline, compare its hue and intensity with the minimum and maximum
color sections of the glass color standards.)
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report the color as acceptable if the hue is approximately the same as the standard
and if the intensity of the color is as follows:
a. Aviation gasoline intensity: between minimum and maximum standards.
b. Motor gasoline intensity: equal to or greater than standards.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method Prepared By:
Army - ME - 1986
September 30, 1986
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