Figure 6.
The graph plots reflectance in arbitrary units against wavelength from 200 to 700 nanometres for R 1 C P, R 2 L S, R 3 S S, R 4 C F, R 5 R L C A, R 6 S M, R 7 G, R 8 W, R 8 F W, R 9 G P, R 10 P and R 11 I. R 8 F W rises strongly after about 350 nanometres and reaches the highest reflectance near 700 nanometres. R 9 G P rises sharply between about 250 and 340 nanometres before gradually decreasing. R 3 S S decreases sharply at shorter wavelengths and then gradually increases. R 4 C F remains low until about 500 nanometres before increasing markedly towards 700 nanometres. R 8 W also rises gradually after about 350 nanometres. The remaining spectra show smaller changes, fluctuations and local peaks across the wavelength range.Average ultraviolet–visible reflectance spectra of the materials under study, after dark correction and normalisation to a white polytetrafluoroethylene reference (R1-CP, cement paste; R2-LS, limestone sand; R3-SS, siliceous sand; R4-CF, ceramic fraction; R5-RLCA, recycled limestone concrete aggregate; R6-SM, siliceous mortar; R7-G, gypsum; R8-FW, wood fibres; R8-W, wood chips; R9-GP, glass powder; R10-P, polyethylene; R11-I, iron)