Claude Mellan was one of many 17th-century engravers with a very well-developed technique of using parallel lines of varying thickness (known as the "swelling line") to give subtle effects of tone (as was Goltzius) – see picture below.
Claude Mellan bio je jedan od mnogih gravera 17. stoljeća s odlično razvijenom tehnikom uporabe paralelnih linija različite debljine (poznatih kao "nabubrene linije") kojima je davao suptilne efekte tona (poput Goltziusa - vidi sliku ispod).