Deposit collectibles
Doesn’t work for special materials though, just common/fine.
Another trick I would like to add, for those who already knew about the Deposit Collectables button but have a mini pet and have the problem of it being desposited as well, there is such things as Invisible bags and Invisible Boxes. What they do is what ever you put into it will not show up when you talk to a merchant but best of all if you go to Deposit all collectables, your minipet as long as its in that bag or box will be ignored; so you can deposit all your collectables and not have to worry about your mini being deposited as well.