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Question for:

In 2016, Dr. Colin Snodgrass, a researcher at the Open University, UK, commissioned The Aroma Company to recreate an unpleasant scent to be impregnated in promotional postcards for what object? The scent consisted of odors that smelled like rotten eggs (hydrogen sulfide), urine (ammonia), burning matches (sulphur dioxide), and almonds (hydrogen cyanide).

Clues