They didn't need to go out and make artificial snot. It's allergy season...I got plenty for them right here:

Researchers at The University of Warwick and Leicester University have used an artificial snot (nasal mucus) to significantly enhance the performance of electronic noses.

The researchers have coated the sensors used by odour sensing "electronic noses" with a mix of polymers that mimics the action of the mucus in the natural nose. This greatly improves the performance of the electronic devices allowing them to pick out a more diverse range of smells.

A natural nose uses over 100 million specialised receptors or sensors which act together in complex ways to identify and tell apart the molecules they encounter. Electronic noses, used in a number of commercial settings including quality control in the food industry, use the same method but often have less than 50 sensors. This means that electronic noses can discern a much smaller range of smells than the natural nose.

However the University of Warwick and Leicester University team have found a way to replicate in their electronic devices how the natural nose's mucus enhances our sense of smell.

In the natural nose the thin layer of mucus dissolves scents and separates out different odour molecules in a way they arrive at the noses receptors at different speeds/times. Humans are then able to use this information on the differences in time taken to reach different nose receptors to pick apart a diverse range of smells.

The Warwick and Leicester team have employed an artificial mucus layer to mimic this process. They placed a 10-micron-thick layer of a polymer normally used to separate gases on the sensors within their electronic nose. They then tested it on a range of compounds and found that their artificial snot substantially improved the performance of their electronic nose allowing it to tell apart smells such as milk and banana which had previously been challenging smells for the device.

University of Warwick researcher Professor Julian Gardner says: "Our artificial mucus not only offers improved odour discrimination for electronic noses it also offers much shorter analysis times than conventional techniques".

They should start a company and call it Snotco. "For all your artificial mucous needs, choose Snotco -- the world's leader in disgusting goo."