To extend and modify the temporary reduction of duty on 3,3 -Dichlorobenzidine dihydrochloride ([1,1-biphenyl]- 4,4 -diamino, 3,3-dichloro-).

Amends the Harmonized Tariff Schedule of the United States to temporarily reduce the duty on 3,3 031'-Dichlorobenzidine dihydrochloride ([1,1 031'-biphenyl]- 4,4 031'-diamino, 3,3 031'-dichloro-).