The materials and procedures of the 19th-century lithographer are duplicated in almost every respect by the contemporary hand printer. An image is drawn with tusche (a carbon pigment in liquid form) and litho crayon before the printing surface is fixed, moistened, and inked in preparation for printing. The printing itself is done on a press that exerts a sliding or scraping pressure.
The dream about keys is a dream that refers to solutions to one's life problems. The question you have to ask yourself when you have this type of dream is 'what is the problem I have today that needs a solution, or a key? (read all at source)
To dream that you are trying to catch your breath or that you are out of breath indicates that you are experiencing some anxiety, tension, or fear concerning a new situation in your waking life. To dream that you have bad breath suggests that you are feeling enclosed or crowded in. Perhaps someone is invading your personal space. To dream that you are holding your breath indicates your stubborn state of mind. Your views are too one-sided. The dream is telling you to be more open to the opinions of others.