41. Bessa developed a masterful use of stipple engraving technique, an essential part of colour printing. 42. Basically the program should make every color either black or white; no grays with stippling . 43. Phalangeal abnormalities are important clinical features to look for once the stippling is no longer visible. 44. In 1815, Walker went to London to study as a stipple engraver under Thomas Woolnoth. 45. His engravings were chiefly in stipple . 46. The blocks were skillfully carved with extremely fine lines to create stippling and variations in tone. 47. The nuclei tend to be regular, round-to-oval and contain stippled chromatin. 48. The tall, narrow windows hand painted with a stipple pattern also contribute to this light. 49. Freeman is known for working mainly in stipple , and the portrait here is no exception. 50. Washes, stipple or dotting effects, and " surface tone " in printmaking are other techniques.
