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Figures (3)

F. 1
F. 1

Spectral reflection curves for two specimens of oxidized aluminum.

F. 2
F. 2

Diffusion characteristics of the light reflected from three specimens of oxidized aluminum when the incident light was perpendicular to the surface.

F. 3
F. 3

Diffusion characteristics of the light reflected from three specimens of oxidized aluminum when the light was incident at an angle of 45 degrees from the perpendicular.

Tables (2)

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Table 1 Spectral sensitivity of fluorescent photometer for measuring ultraviolet reflection-factors.

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Table 2 Diffuse reflection-factors for light, relative diffuse reflection-factors for ultraviolet (see text), and diffuse reflection-factors at λ2967 for various specimens of aluminum. Hydrofluoric acid etch—Specimens A-1 to A-8 and D-1 to D-8.Sodium hydroxide-sodium fluoride etch—Specimens AX-1/2 to AX-2 and DX-1/2 to DX-2.Sodium hydroxide-sodium chloride:hydrofluoric acid etch—Specimens ANF and DNF.All samples marked A and D were from two different lots of aluminum sheet (2S), and the number after the letters indicates the number of minutes the specimen was immersed in the etching reagent, hydrofluoric acid, for example.