Thin layer aluminate deposition - accidental discovery
Channel: Ilusys Systems
Date: 2019-12-29

Reaction: https://youtu.be/-AtNJHPOHG4
Hard to tell what this substance actually is. Worst case this will be sodium aluminate. To eliminate this possibility I would have to try to break stoichiometry, which can take quite a lot of time. Or X-ray..

Best chance is let somebody wiser explain what's going on in comments.