My scalp condition is that I have too much hair. Too dense and thick, it gets greasy after not washing it 1 day, so I don’t even dare to replicate your experiment.
I also used to have a cold weather dandruff problem, but that was solved entirely when I started always air drying after every shower. Thanks to a random tip years ago on reddit. My dandruff problem was apparently because of humidity.
Are you doing research for a personal project or just asking for a friend?