Black and white proof

Original Toronto Star caption: Black and white proof: Technologists show off obvious success of their new sewage slime fighter. At left; Werner Lewandowski holds a bottle of sewage after it has been treated by the old process. At right; engineer Stephen Black compares a sample of the same sewage after it has been processed with time. The old method kills 37 per cent of pollution. New method kills 92 per cent.