(7) Touche drawing with etching color and citric acid.
[Mixed Method: Relief and Intaglio united]—
(1) Pen drawing combined with engraving.
(2) Intaglio drawing with relief tint.
(3) Intaglio and relief with several plates.
(4) Transformation of relief into intaglio, and vice versa.
(1) Printing simultaneously with water colors and oil colors.
(2) Simultaneous chemical and mechanical printing.
(3) Application of the stone for cotton-printing through wiping—a unique printing method.