Answer:
By increasing the density of the lines
Step-by-step explanation:
The Three Crosses is a print in drypoint by Rembrandt van Rijn. To create a drypoint print, the artist uses an etching needle, a type of a metal tool with a fine tip, to create incisions on a copper plate. The needle produces a raised edge called a burr, because of which a drypoint line holds more ink. Thanks to this, drypoint prints have a velvety look, allowing the artist to create deep shadows and dramatic tonal variation. By increasing the density of the lines, van Rijn managed to increase the contrast between different parts of the print.