Etching In contrast to engraving, here the artist uses acid to cut into the plate. Foxing Reddish-brown patches of fungus that appear on many works on paper. Thrives in damp conditions and can eventually destroy paper. Half-tone is the form of reproduction used in magazine and newspaper illustration, and is very easy to distinguish under magnification because of the regular shape of the dots. Apart from the absence of a number they do not differ from impressions in the edition.
Heliogravures can be very difficult to distinguish from etchings and engravings.
Impression Any single example of a print. A smooth, warm-toned paper traditionally made from mulberry fibers. It absorbs ink very differently from European paper, allowing it to spread on the surface creating added richness. Probably first imported into the West in the 17th century. Thin wire lines run horizontally across the mold and are held by heavier vertical chain lines, which are spaced at wider intervals.