FED-STD-791D
Method 103.6
September 30, 1986
COLOR OF GASOLINE
1. SCOPE
1.1 This method is used for determining the acceptability of color of dyed gasolines
(aviation or motor).
2. SUMMARY
2.1 The method consists of comparing the hue and color intensity of the gasoline with
those of permanent-color (glass) standards.
3. SAMPLE SIZE
3.1 Approximately 480 mL of gasoline to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Color comparator (Hellige Inc., Garden City, N.Y., Aqua-Testers No. 611A, or
equal), split-field, for viewing simultaneously (by transmitted light) the sample and the
combination of the reference liquid and the permanent-color standard.
4.2 Fluid tubes (2), glass, 20.0-cm viewing depth, with a fused-on plane bottom plate
(Hellige Nessler tube No. 611-T, or equal).
4.3 Plungers, fluid-tube (2), polished optical glass (Hellige Nessler plunger No. 611-PL,
or equal).
4.4 Gasoline color standards, permanent-color glass disc (as required):
a. Aviation gasoline standard (Hellige 611-95 and 611-96, or equal).
b. Motor gasoline standard (Hellige 611-97 or equal).
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method 10000,
Material Handling Safety Precautions, is a reference which lists all toxic and hazardous materials
cited in FTMS 791. The synonyms, life hazard, flammability, handling and storage precautions,
emergency treatment and measures, and spill practices of each chemical are explained.
5.2 Reference liquid; either a sample of the gasoline under test (prior to addition of dye
or tetraethyl lead), or distilled [1,3,0].
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