Tracing, Tracing paper

Made by immersing good quality paper in sulfuric acid for a few seconds. The acid converts some of the cellulose into amyloid form having a gelatinous and impermeable character and translucent quality. When the treated paper is thoroughly washed and dried, the resulting product is much stronger than the original paper. Tracing paper takes it's name from it's ability for an artist to trace an image onto it. When tracing paper is placed onto a picture, the picture is easily viewable through the tracing paper.

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George Pitt, probably after Sir Henry Cheere, 1st Bt, circa 1900 (circa 1738-1741) - NPG  - © National Portrait Gallery, London

George Pitt
probably after Sir Henry Cheere, 1st Bt
circa 1900 (circa 1738-1741)
NPG D20961

Louise of Savoy, formerly known as Katherine of Aragon, after Jacobus Houbraken, after  Hans Holbein the Younger, 1743 - NPG  - © National Portrait Gallery, London

Louise of Savoy, formerly known as Katherine of Aragon
after Jacobus Houbraken, after Hans Holbein the Younger
1743
NPG D24180

King William IV, after a drawing by Sir Francis Leggatt Chantrey, 1837 (1830) - NPG  - © National Portrait Gallery, London

King William IV
after a drawing by Sir Francis Leggatt Chantrey
1837 (1830)
NPG 316a(141)

Detail of jewels from portrait of an unknown woman, formerly known as Mary, Queen of Scots, by Sir George Scharf, after  Hans Eworth, circa 1857-1895 (1540s) - NPG  - © National Portrait Gallery, London

Detail of jewels from portrait of an unknown woman, formerly known as Mary, Queen of Scots
by Sir George Scharf, after Hans Eworth
circa 1857-1895 (1540s)
NPG D22545

James Wolfe, by Harold Lee-Dillon, 17th Viscount Dillon, after a drawing attributed to  Sir Harvey Smyth, Bt, circa 1860-1884 - NPG  - © National Portrait Gallery, London

James Wolfe
by Harold Lee-Dillon, 17th Viscount Dillon, after a drawing attributed to Sir Harvey Smyth, Bt
circa 1860-1884
NPG 713a

Sir George Scharf, by Sir George Scharf, (1872) - NPG  - © National Portrait Gallery, London

Sir George Scharf
by Sir George Scharf
(1872)
NPG D20912

Mary, Queen of Scots, by Sir George Scharf, after  Unknown artist, 1880s? - NPG  - © National Portrait Gallery, London

Mary, Queen of Scots
by Sir George Scharf, after Unknown artist
1880s?
NPG D20918

Unknown couple, called Robert Carr, Earl of Somerset; Frances, Countess of Somerset, by James Donald Milner, probably after  Paul van Somer, 1 December 1911 - NPG  - © National Portrait Gallery, London

Unknown couple, called Robert Carr, Earl of Somerset; Frances, Countess of Somerset
by James Donald Milner, probably after Paul van Somer
1 December 1911
NPG D21673

Thomas Cartwright, by Sir Henry Hake, after  Isaac Beckett, after  Gilbert Soest, circa 1927-1951 - NPG  - © National Portrait Gallery, London

Thomas Cartwright
by Sir Henry Hake, after Isaac Beckett, after Gilbert Soest
circa 1927-1951
NPG D21670

Humfry Gilbert Garth Payne, by (Margaret) Ithell Colquhoun, 1934 - NPG  - © National Portrait Gallery, London

Humfry Gilbert Garth Payne
by (Margaret) Ithell Colquhoun
1934
NPG 5269

Somerset Maugham, by Graham Vivian Sutherland, 1953 - NPG  - © National Portrait Gallery, London

Somerset Maugham
by Graham Vivian Sutherland
1953
NPG 5328

Richard George Rogers, Baron Rogers of Riverside, by Sir Eduardo Luigi Paolozzi, 1988 - NPG  - © DACS / Estate of Sir Eduardo Luigi Paolozzi

Richard George Rogers, Baron Rogers of Riverside
by Sir Eduardo Luigi Paolozzi
1988
NPG 6022(9)

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