mordanting

from The Collaborative International Dictionary of English v.0.48

Mordant \Mor"dant\, v. t. [imp. & p. p. {Mordanted}; p. pr. &
   vb. n. {Mordanting}.]
   To subject to the action of, or imbue with, a mordant; as, to
   mordant goods for dyeing.
   [1913 Webster]