Which preposition to use with brownness

from Occurrences 1%

Then she went to the house of her godfather, the captain of the town, and washed all the brownness from her face, and clad herself in robes of rich silk.

of Occurrences 1%

Was it partly by reason of his inordinate romantic good looks, those of a gallant, genial conqueror, but which, involving so glossy a brownness of eye, so manly a crispness of curl, so red-lipped a radiance of smile, so natural a bravery of port, prescribed to any response he might facially, might expressively, make a sort of florid, disproportionate amplitude?

Which preposition to use with  brownness