Invented at the end of the eighteenth century, a lithograph is a print produced by a method of surface printing. A design is drawn or painted on to a flat surface with a greasy ink or chalk and then water is washed over it. Oil-based printing ink is rolled on to the stone; it sticks only to the greasy parts, being repelled from the water-covered areas. Reverse prints are then taken on paper in a lithographic press. Popular for posters because it allows multiple production.

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The United Irish Patriots of 1798
published by Selig Lipschitz
probably late 19th century
NPG D10700

'High life'
by Richard James Lane, after Sir Edwin Landseer
circa 1825-1850
NPG D22017

Queen Nzinga Mbande (Anna de Sousa Nzinga)
by Achille Devéria, printed by François Le Villain, published by Edward Bull, published by Edward Churton, after Unknown artist
NPG D34632

Lady Hester Lucy Stanhope
by Robert Jacob Hamerton, printed by Charles Joseph Hullmandel, published by Richard Bentley
NPG D5409

Henry Brougham, 1st Baron Brougham and Vaux ('The Celebrated Vaux Hall Performer on the Tight Rope')
by John ('HB') Doyle, printed by Ducôte & Stephens, published by Thomas McLean
published 16 September 1834
NPG D16783

'Izaak Walton - the old English angler'
by and published by Dean & Co
published circa 1849-1855
NPG D19394

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