I use HP ink with my HP Photosmart C-6180 all-in-one printer. Usually I simply use it to print documents black and white documents. Sometimes when editing something, or if I'm using a printed recipe card, and the paper gets a drop of water or coffee on it, the black print smears, sometimes so blurry as to be unreadable. Should I use a different ink, or special paper? I'm using a generic ink jet paper.