MIL-DTL-44436B
4.5.2 Colorfastness evaluation testing. When testing for colorfastness properties, each color
shall be evaluated, whenever possible, separately and reported as such. In cases where the print
pattern does not allow for the evaluation of each color separately, the test results should indicated
which colors were evaluated together.
4.5.2.1 Operation Enduring Freedom Camouflage pattern (OCP) (Class 9 and 10). All
Colorfastness testing for Operation Enduring Freedom Camouflage pattern (Class 9 and 10) shall
be performed on the solid color area and not the tonal area.
4.5.3 Spectral reflectance test. Spectral reflectance data shall be obtained from 600 to 860
nanometers (nm) for Classes 1, 2, 5, 6, 7, 8, 9 and 10 and 700 to 860 nanometers (nm) for
Classes 3 at 20 nm intervals on a spectrophotometer relative to the barium sulfate standard, the
preferred white standard. Other white reference materials may be used provided they are
calibrated to absolute white, e.g. magnesium oxide or vitrolite tiles. The spectral band width
shall be less than 26 nm at 860 nm. Reflectance measurements shall be made by either the
monochromatic or polychromatic mode of operation. When the polychromatic mode of operation
is used, the spectrophotometer shall operate with the specimen diffusely illuminated with the full
emission of a continuous source that simulates either CIE Source A or CIE Source D65.
Measurements shall be taken on a minimum of two (2) different areas and the data averaged.
The measured areas should be at least 6 inches away from the selvage. The cloth for Classes 1,
and 2 shall be measured as a single layer using three backing layers of the same shade for Light
Green 354, Dark Green 355 and Brown 356 colors. The cloth for Class 5 shall be measured as a
single layer using two backing layers of the same shade for Black 357. The cloth for Classes 3
shall be measured as a single layer backed with four layers of the same shade cut from the
standard. The cloth for Classes 6, 7, 8, 9 and 10 shall be measured as a single layer backed with
four layers of the same shade. The specimen shall be viewed at an angle no greater than 10
degrees from normal, with the specular component included. Measurements shall be taken on a
minimum of two different areas. Specimens shall be oriented in different directions during
testing. When possible, the specimens tested shall not contain the same warp or filling yarns
when presented to the sample port. Photometric accuracy of the spectrophotometer shall be
within 1 percent and wavelength accuracy within 2 nanometers. The diameter for standard
aperture size used in the color measurement device shall be 1.0 to 1.25 inches for Classes 1, 2, 3
and 5, and 0.3725 inches or larger for the Classes 6, 7, 8, 9 and 10. Any color having spectral
reflectance values falling outside the limits at four or more of the wavelengths specified shall be
considered a test failure.
4.5.4 Toxicity testing. Unless otherwise specified (see 6.2), an acute dermal irritation study
and a skin sensitization study shall be conducted on laboratory animals. When the results of
these studies indicate the cloth is not a sensitizer or irritant, a Repeat Insult Patch Test shall be
performed in accordance with the Modified Draize Procedure (See 2.3). If the toxicity
requirement (see 3.14) can be demonstrated with historical use data, toxicity testing may not be
required (see 6.2).
5. PACKAGING
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