The Grey Wig by Israel Zangwill

Hitherto that portly lady's hair had been black. But now, as suddenly as darkness vanishes in a tropic dawn, it was become light. No gradual approach of the grey, for the black had been equally artificial. The wig is the region without twilight. Only in the swart moustache had the grey crept on, so that perhaps the growing incongruity had necessitated the sudden surrender to age.

To both Madame Depine and Madame Valiere the grey wig came like a blow on the heart.