Inhibition of Yellowing
However, yellowing of the silk fabric was intensified in the process. Yellowing indexes
may vary with the catalysts used.
no yellowing is observed in the absence of the catalyst(M+X"').
The more nucleophilic the catalyst, the more serious is the yellowing.
The catalytic reaction mechanism of epoxide with silk in which the nucleophilic catalyst attacks the epoxy group,
would liberate alkali during the reaction