A collection of every single kind of Ink, over the last 100 years.
https://www.popularmechanics.com/technology/news/a13875/secret-service-ink-forensics-library/
Well somebody has to be keeping all of those databases.
They take care of US currency, so they would be interested in various and sundry inks.
This kind of thing is definitely necessary, when it comes to authenticating old documents, books, and ephemera.
And ransom notes.
And threats.
And forgeries.
I’ve heard there’s an art museum at Harvard that has a collection of old pigments for just that reason.
I know a woman who does a lot of custom sewing work, and this includes using vintage and period fabrics as much as she can.
Several years ago, before starting one project, she put 60 pieces of cloth into the washing machine, and removed 55 from the dryer. She did that on purpose, because she wanted to make sure these items would hold up to modern care standards before proceeding.
Am I remembering correctly that some large law enforcement agency kept a collection of typewriters, just to allow type comparison? (Back when non-handwritten written evidence would had to have been done on a rypewriter.)
I used to have similar experiences with socks in the days when I used laundromats.
Who does her plumbing?
I just want to know if she has a wormhole that connects her washing machine to her dryer.