What Is a Contour Map?

The outline thumbnail wheel refers to a small thumbnail in the blank space of the printed sheet in the etched print of the outline thumbnail. Sheets with outline sketches are called outline sketch proofs. When etching large sketches, the artist draws outline sketches at the edges of the plate, which can help to make corrections from one trial version (STATE) to the next trial version when making large etching etchings, and can be used to put acid in the entire etching plate The solution tests the extent to which the metal etchant has corroded the plate. ^[1]