I'm sure there were plenty of people out there who could have helped them out with nasal mucus. They didn't have to go to the trouble of making fake mucus.

British scientists have created artificial nasal mucus to enhance the performance of electronic "noses."

The researchers at the University of Warwick and Leicester University coated sensors used by odor sensing electronic sensors with a mix of polymers that mimics the action of the mucus in the natural nose. They found the artificial mucus greatly improved the performance of the electronic devices, allowing them to identify a more diverse range of smells.

Did you ever stop to think that everything you smell actually smells like whatever you are smelling + the inside of your nose?

The inside of my nose does not smell.

........