An intaglio technique in which a metal plate is manually incised with a burin, an engraving tool like a very fine chisel with a lozenge-shaped tip. The burin makes incisions into the metal at various angles and with varying pressure which dictates the quantity of ink the line can hold—hence variations in width and darkness when printed. The technique of engraving metal dates from classical antiquity as a method of decorating objects. However it was not until about 1430 in Germany that engraved plates began to be used for making prints. Photoengraving is a process using acid to etch a photographically produced image onto a metal plate that can then be printed from.