Slumping mica powder in a wine bottle
Hi! If you use a mica powder that already has a binder in it and mix it with some water it may help it stay more evenly applied, but I’m just guessing. Also you could put a bit of the tack glue (for fusing) in the bottle then add the powder and shake it around. I know these things work when using glass and not fusing so I am just thinking it might work, but I’m very, very new to warm glass work so I may not even know what I’m talking about -lol!