To explain more, I can click on any enchanters profile who has a Bag of Powder equipped, and click on it and 'use' it and an area emote saying
"(character name) begins to look hazy, but nothing happens."
This happens even if the enchanter is not in the same area as my character.
Not sure if this means enchanters could use other enchanters powder or not.
Just thought I would mention it. And I don't know what prompted me to try and use someone else's item, I just did