reddener

noun

1. Someone or something which reddens.

   “Henna, a vegetable extract, was one of the earliest known dyes and is still used as a reddener for hair; nitrate of silver and gum water, walnut juice, iron rust, vinegar - all sorts of recipes have been tried over the years...”

   “Reddener of eagles' footsoles: "arnar il-rjóðr" = "rjóðr arnar ilja," who provides bleeding corpses for eagles to stand on and tear, warrior, Magnus the Good.”