I'm not sure which technique they use but this person makes jewelry from snowflakes. They have videos showing their process, where they catch them on a tray and

I'm not sure which technique they use but this person makes jewelry from snowflakes. They have videos showing their process, where they catch them on a tray and transfer them using a paintbrush to slide covers that are holding some chemical which capture their shape. Eyeballing it I think they're using the Formvar method. https://www.preservedsnowflake.com/ https://www.preservedsnowflake.com/ https://youtube.com/@preservedsnowflakeco https://youtube.com/@preservedsnowflakeco