 These are called (although the terms are less often used now) the "Fine Manner" and the "Broad Manner", referring to the typical thickness of the lines used to produce shading within the main contour lines.The terms are somewhat compromised by a division of the Broad Manner into two groups with a different technique, both found in the works probably by Francesco Rosselli.He appears to have not only introduced to Florence the German-style burin with a lozenge-shaped section that the technique requires, but to have subsequently reinvented his technique.