The dyeing of wool, both with respect to rate of coloration and depth of penetration of fibers, has in the past been used as a tool to detect the locus of resin deposition. It has now been demonstrated that the results obtained from dyeing experiments are highly dependent upon the choice of dye. Whereas one dye may color more slowly and not penetrate resin-treated fibers, another may show increased rate and better penetration with treated wool fibers than with untreated. Thus, the conclusions based on observations made with one particular dye may be opposite to those from use,of another dye.