crocking

from The Collaborative International Dictionary of English v.0.48

Crock \Crock\, v. t. [imp. & p. p. {Crocked} (kr[o^]kt); p. pr.
   & vb. n. {Crocking}.]
   To soil by contact, as with soot, or with the coloring matter
   of badly dyed cloth.
   [1913 Webster]