I was recently given some black ink powder. So I boiled my distilled water and mixed in some of the powder (enough to give me a dark grey color, which is what I wanted; I've got my saturaed fp ink for black black). But it's running off my glass dip pen too wet. It just pours onto the page and feathers where it really shouldn't be feathering. This is my first experience with dip inks, but I'm assuming I need to thicken it and make it drier. So do I just add more and more powder until it's thicker? Or should I pick up some gum arabic? Thanks for your answers