The greening of wool in normal air is caused by ultraviolet light at various wavelengths, 303 mμ and shorter, corre sponding to photon energies of 94.4 kcal and above. The green color, which normally disappears in thermal reactions in the presence of O2 and H 2O, increases considerably in dry nitrogen in the dark. The significance of these findings is discussed,
Launer, Herbert F., Effect of Light Upon Wool. I. Greening and Yellowing by "Germicidal" Ultraviolet, Textile Res. J.33, 258-263 (1963).
2.
Launer, Herbert F., Effect of Light Upon Wool. III. Post-Irradiation Loss of Color in the Dark after "Germicidal" UV Exposure, Textile Res. J.33, 910-918 (1963).
3.
Launer, Herbert F., Photobleaching of Wool Regardless of Yellowness Cause, Textile Res. J.41, 211-214 (1971).
4.
Lennox, F.G. , A Spectrophotometric Study of Yellowing in Wool Fabric, J. Textile Insl.51, T1193-1209 (1960).
