Knock Out Printing - What is knock out printing?

Answer:

The required image or text is not actually printed but is created by printing the background around it so that the unprinted areas of the substrate form the image or text. For example, it can be used to create white text by flood coating a white piece of paper with another colour, except for areas in the shape of the required text. The white paper shows through in the unprinted areas and becomes the text.