Has anyone tried these zinc stars on Skylighter?

https://www.skylighter.com/blogs/how-to-make-fireworks/zinc-stars

They seem like the easiest stars to make for a newbie with limited materials, just black powder stuff & zinc. Mostly doing 15mm, 20mm, & 37mm tubes so I plan on making them small. If anyone has tried them, can you drop a vid? Thanks!

Would also appreciate any other recommendations for stuff to add to small areal shells for cool effects, gonna try a bp/steel wool mix this weekend, heard it gives a crackle effect