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)
2. Understand the dream meaning of a door. Doors are a symbol of transition. Dreaming about a door is suggestive that you are in need of change, or that you are currently undergoing a transition from one stage in your to another. Doors can lead to adventure, secrets, opportunities and new starts. It is a dream telling you to keep pushing that door open and to move on to the inevitability of change. 2  A person who does not want to change can be left stuck in the past and grieving for the person they once were. 3  A door that will not open is indicative of your unwillingness to transition.