Chalk is a soft powdery white or off-white writing or drawing material in crayon form, generally used on a blackboard or other dark surface

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  • Tacita Dean, 'The Roaring Forties: Seven Boards in Seven Days' 1997
    Tacita Dean
    The Roaring Forties: Seven Boards in Seven Days 1997
    © Tacita Dean, courtesy Frith Street Gallery, London and Marian Goodman Gallery, New York/Paris
  • Juan Gris, 'The Sunblind' 1914
    Juan Gris
    The Sunblind 1914
    Gouache, collage, chalk and charcoal on canvas
    support: 921 x 727 mm
    frame: 1001 x 812 x 79 mm
    Purchased 1946
  • attributed to Francesco Bartolozzi, 'Eros and Psyche' date not known
    attributed to Francesco Bartolozzi
    Eros and Psyche date not known
    Pencil and chalk on paper
    support: 335 x 337 mm
    Purchased as part of the Oppé Collection with assistance from the National Lottery through the Heritage Lottery Fund 1996
  • Thomas Gainsborough, 'Wooded Landscape with Peasant Asleep and Horses outside a Shed' circa 1775-80
    Thomas Gainsborough
    Wooded Landscape with Peasant Asleep and Horses outside a Shed circa 1775-80
    Pastel and chalk on paper
    support: 254 x 314 mm
    Presented by T. Birch Wolfe 1878

Chalk is an inorganic material composed of calcium carbonate. It is naturally occurring, but has also been produced industrially throughout the twentieth century.