Printing methods. F lexography. Flexography is a printing method where you have a plate where lettering on it, cover it in ink and then you just press it against the paper and it prints the letters onto the paper. L ithography.
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Lithography originally used an image drawn with oil/fat/wax on the surface of lithographic limestone plate, which after being treated with a mixture of acid and gum arabic, and then with water, did attract ink, but only in the drawing's sticky areas and not in the wet etched areas clear of oil/fat/wax, which application prevented etching. The ink was then transferred to a blank paper sheet producing a printed page.
You scratch an indented picture into a piece of zinc and then cover it in a slight layer of oil ink and then wipe it off so the ink remains in the indent. Then you lay a piece of damped paper on top of the zinc and it will pick up the ink in the indents and create a picture.