Amount of Copper in Tea sprayed with Bordeaux Mixture

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As a result of a bad attack in tea gardens of blister blight caused by the fungus Exobasidium vexans, Mr McRae, the officiating Imperial Mycologist, was deputed by Government to combat the disease. Mr McRae has tried the effect of spraying the tea bushes with Bordeaux mixture on an experimental scale. In view, however, of the recent scare in America over the sale of grapes sprayed with Bordeaux mixture, it was thought desirable to have these spraying experiments under chemical control. Accordingly an area in a tea garden was set apart and the bushes sprayed with Bordeaux mixture. After nine days the tea was picked both from the sprayed and from an unsprayed area, and about 80 lbs. (a chest) of tea was manufactured from the produce of each area. Great care was taken to prevent contamination. Samples of tea both from the sprayed and unsprayed areas were carefully sealed up and sent to this office for analysis. None of this tea was put on the market.