JAIC 1986, Volume 25, Number 2, Article 1 (pp. 65 to 72)
JAIC online
Journal of the American Institute for Conservation
JAIC 1986, Volume 25, Number 2, Article 1 (pp. 65 to 72)

DETERMINATION OF THE SPECIFIC RATE CONSTANT FOR THE LOSS OF A YELLOW INTERMEDIATE DURING THE FADING OF ALIZARIN LAKE

Robert L. Feller, Ruth M. Johnston-Feller, & Catherine Bailie



7 CONCLUSION

TABLE IIISUMMARIZES the values of k1 previously reported (obtained from equation ii) and of k2 obtained from the graphical solution of equation vii. For the particular batch and dispersion of alizarin lake/titanium white paints used in this investigation, the specific rate of disappearance of the yellow intermediate indeed seems to be a constant, suggesting that the fading of the yellow intermediate also proceeds according to first-order kinetics.

Table III Specific Rate Constants k1 and k2 for Fading of Alizarin Lake in Mixture With Titanium White in Xenon-Arc Fade-ometer¯ (Pyrex/Pyrex Filters) Vehicle: Poly(vinylacetate) Vinac¯ B-7; Complete Hiding

These initial interpretations concerning the apparent rate of fading of alizarin lake confirm the potential usefulness of modern color-matching computations in facilitating the analysis of the phenomenon of fading in paints according to well-known principles of chemical kinetics.


Copyright © 1986 American Institute of Historic and Artistic Works