I must have come across as lecturing about fumes. Sorry about that. I was just nerdy from a chemist standpoint. A bit tounge-in-cheek too.
Point taken on the dry cotton swab. That is easy to remedy, just add a few drops of water.
Actually, this seems like an experiment I would enjoy to do. Anyone passing ARN just give me a heads up and I will prepare an array of different swabs for you. :-D