Predicate: blacken
blacken: Frames file for 'blacken' based on survey of sentences in the WSJ
corpus.
Roleset id: blacken.01 , to make black, vncls: 45.4, framnet:
Roles:
        Arg0: causer of blackening, agent (vnrole: 45.4-Agent)
        Arg1: thing made black (vnrole: 45.4-Patient)
Example: passive
        person: ns,  tense: present,  aspect: ns,  voice: passive,  form: participle
        Although Exxon spent heavily during the latest quarter [*-2] to clean up [the Alaskan shoreline]*-2 blackened [*-2] by its huge oil spill , those expenses as well as the cost of a continuing spill-related program are covered [*-1] by $ 880 million [*U*] in charges taken [*] during the first half .
        Rel: blackened
        Arg1: [*-2]
        Arg0: its huge oil spill