How did Lichtenstein make his dots?

Artist: Roy Lichtenstein Title: Spray Can Portfolio: 1¢ Life Medium: Lithograph on white wove paper Year: 1963 Edition: 1762/2000 Frame Size: 21 1/4" x 19 1/4" Sheet Size: 16" x 11 1...

Roy Lichtenstein, 'Paper Plate', serigraph, 1969, edition unknown, Corlett III.45. Printed in dark blue ink verso, 'Roy Lichtenstein © On 1st Inc. 1969'. A fine impression, on white paperboard pressure formed into a 3-dimensional plate; age toning verso, otherwise in very good condition. Published by Bert Stern, New York. Image size 10 1/4 inch diameter, 1-inch depth. Archivally sleeved, unmounted, unframed. Carefully protected for shipping. Literature: John Russell. 'Art: Time for Old-Master Prints', New York Times (July 27, 1979), p. C16. Jan Howard. 'Reflections on 'The Prints of Roy Lichtenstein', Print Collector's Newsletter 26 (July–August 1995), p. 82. Mark M. Johnson. 'The Great American Pop Art Store: Multiples of the '60s', Art & Activities 123 (June–Summer 1998), ill. p. 37 (color). Mary Lee Corlett. 'The Prints of Roy Lichtenstein: A Catalogue Raisonné', New York, 2002, p. 286, no. III.45. Susan Dackerman, ed., 'Corita Kent and the Language of Pop', exhibition catalog, Harvard Art...

Roy Lichtenstein The Red Horsemen, aka The Equestrians (with COA from the 1984 Olympic Committee), 1982 Limited Edition Lithograph and offset Lithograph on Parsons Diploma Parchment...

Artist: Roy Lichtenstein Title: Rose, Cover from 1 Cent Life (Rose) Screenprint in green over yellow linen and (1 Cent Life) Screenprint in pink over blue lettering on board of unbound book Year: 1964 Medium: Silkscreen on linen on heavy board Size Edition : 2000 Dimensions: 16.31" x 25.32" (Full cover) Dimensions of Image: 16.31 x 11.88 References : Corlett # III.3 Provenance: Private Collection, Berlin Printed by Maurice Beaudet in Paris and published by E. W. Kornfeld, of Bern, Switzerland. Edition of 2000, unsigned as issued in the regular edition of Walasse Ting's '1¢ Life' portfolio of 1964. Superb impression with good strong colors. This iconic piece was executed by Lichtenstein and printed onto stiff paperboard to serve as the front cover of 1 Cent Life, published in 1964 by Kornfeld in an edition of 2000. The image is printed to the edge of the board, with the Lichtenstein silkscreen...

Roy Lichtenstein, ‘St. Macarius Before His Monastery,’ circa 1951: Included in the Roy Lichtenstein Foundation, Roy Lichtenstein: A Catalogue Raisonné - this unique, rare early sket...

Silkscreen on Mylar. Inscription: unsigned and unnumbered, as issued. Good condition. Notes: From the folio, X + X, Ten Works by Ten Painters, 1964. Published by the Wadsworth Athene...