I would love the ability to archive a polish. I occasionally destash polishes to make room for new ones, and to have the option to move a polish from the list that I own, to an archive, would be fantastic.
That's a great idea! I'll add it to the to-do list. In the meantime, you can still keep track of destashed polishes by leaving a private note on the polish's page. When you export your polish list, anything with a note will show up.