A-A-208 Ink, Marking, Stencil, Opaque (Porous And Non-Porous Surfaces)This commercial item description covers four types of opaque ink for marking on porous and non-porous surfaces.

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A-A-208C

Color 1/	Minimum Contrast Ratios
	0.90
White (No. 37875)	1.00
Black (No. 37038)	1.00
Gray (No. 36231)	0.80
Red (No. 31136)	0.90
Yellow (No. 33538)	1.00
Green (No. 34108)	1.00
Blue-Dark (No. 35044)	0.95
Blue-Light (No. 35109)	1.00
Orange (No. 32246)	1.00
Maroon (No. 30111)	1.00
Brown (No. 30117)	1.00
Brown (No. 30140)	1.00
Red (No. 31158)	1.00

1/. The numbers in parenthesis following color names are identified in Fed-Std-595.

5.3.2 Color (for all types). The color of the stencil shall be a general match to the specified color in table 1 as determined by visual inspection under illumination in accordance with ASTM D 1729. The sample for the test shall be prepared in the following manner: Apply a film of the sample ink at complete hiding to a non-porous panel and allow to dry completely. If the visual inspection described above proves inconclusive, the color variance of AE 1.75 maximum will be considered acceptable.

5.3.3 Gloss. For types I, III, and Iv stencil ink shall be tested on an absorbent surface and for type II gloss shall be tested on fiberboard with a maximum gloss reading o 10 being acceptable as tested in accordance with ASTM D 523.

5.3.4 Solids. The solids for type III, shall be a minimum of 53 grams by weight of the filled aerosol container except black, which shall have a minimum of 45 grams in a nominal one pint container as tested in accordance with ASTM D 2369.

5.3.5 Stenciling. The stenciling tests below shall be performed upon the inks under two conditions: as manufactured; and, after storing in an oven for 14 days at 120^oF.

5.4 Resistance to Rubbing. Stenciling shall prevent legible characters of uniform boldness and general appearance and the ink shall not smear 15 minutes after application at 23^oC (70^oF) for 4 hours. Remove from water and air-dry for 1 hour. The stenciled lettering shall be legible, retain its characteristic color, or smear after vigorous rubbing with fingers nor crack or peel.