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Petrol tainted Riesling and some South African responses

My previous article (‘Bad Riesling and unleaded petrol’) posed the idea that the petrol or kerosene smell on aged Rieslings came from poor vineyard practices, specifically over exposure to sunlight. My article was based on a widely-held belief in Australia that the smell (caused by TDN, or 1,1,6,-trimethyl-1,2-dihydronaphthalene) was a fault.
14 February 2017 Dave March CWM