Buti comments thus:⁠—

“As it pleased God to give black hair to one, and to the other red, so it pleased him to give more grace to one than to the other.”

“As it pleased God to give black hair to one, and to the other red, so it pleased him to give more grace to one than to the other.”

And the Ottimo says:⁠—

“One was red, the other black; which colors denote the temperaments of men, and accordingly the inclination of their minds.”