I like to use brass when working with a glass that has reactions with extreme hot to cold changes. Like raku--Heat up the raku, then press it with a brass shaper, to cool it fast and get extra color out. Or if I want the glass I added to be pushed down but not spread so much, I'll use the brass, because it's more likely to "freeze" the glass in place rather than spread it out.
I like the graphite for gentle shaping where I want the glass to move a bit more.
I use both a lot!
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