Pulmonary embolism is the sudden blockage of a major blood vessel (artery) in the lung, usually by a blood clot . In most cases, the clots are small and are not deadly, but they can damage the lung. But if the clot is large and stops blood flow to the lung, it can be deadly.
The term chiaroscuro (from the Italian words chiaro, meaning light, and scuro, meaning dark) refers to the use of light and shade in a work of art to define three-dimensional objects. Masters of this technique were the Italians Leonardo da Vinci and Caravaggio and the Dutch painter Rembrandt.
Aquatint. An etching technique that creates areas of tone through the use of powdered resin that is sprinkled on the etching plate prior to being bitten by the etching acid. The result is a finely textured tonal area whose darkness is determined by how long the plate is bitten by the acid.Chiaroscuro woodcut.ntaglio. Any of the techniques in which an image or tonal area is printed from lines or textures scratched or etched into a metal plate (engraving, etching, drypoint, aquatint, lift ground, soft ground).