The effect of dissolved transition metal complexes on the rate of yellowing of linseed oil
A number of metal complexes were examined as potential antiyellowing additives for linseed oil-based coatings. Yellowing was measured as the rate of increase of the absorbance at 400 nm of solutions of 20% linseed oil in toluene. Most metal complexes increased the yellowing rate, but 1,1-bis(diphenylphosphino)ferrocene retarded the rate by 50% over a wide concentration range, and some complexes caused nonlinear changes that might make them useful as additives.
Zhong Chen and Patrick E. Hoggard, "The effect of dissolved transition metal complexes on the rate of yellowing of linseed oil", J. Am. Oil Chem. Soc. 76, 277-280 (1999).