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 see a bat in house or car in your dream indicates that the money which you got from bad ways will disturb you, by regretting from a lie you said, you will confess the truth. To dream that you are afraid of the bat refers to an accident which you will recover without any harm. To hold or feed a bat in your dream may symbolize that by catching the deficiency of your enemy, you will maket his person needer for yourself, and your enemy will do something for you.