Sandra Betty Blow (14 September 1925 – 22 August 2006) was an English abstract painter and one of the pioneers of the British abstract movement of the 1950s. Blow's works are characteristically large scale, colourful abstract collages made from discarded materials.

Born in London, she suffered scarlet fever as a child, spending weekends and holidays at her grandparents' fruit farm in Kent. There she spent time painting, before enrolling at Saint Martin's School of Art between 1941 and 1946, and then the Royal Academy Schools, 1946–1947. She later enrolled at the Accademia di Belle Arti in Rome, where she met Alberto Burri, her partner of a few years.

In 1934, Blow suffered with scarlet fever, followed by rheumatic fever, from which her heart never fully recovered. After attending a local primary school, Blow was educated at a private girls school. At the age of fourteen, Blow was evacuated with her mother and two brothers to Paddock Wood in Kent, near her grandparents' fruit farm, where she spent her time reading, drawing and painting. During this time she joined the artists' social scene, meeting people such as Lucian Freud, John Minton and Francis Bacon. She spent a short period in 1947 at the Royal Academy schools, but found the teaching dull, so instead travelled to Italy to study classic art. There she was inspired by Nicolas Carone to enrol at Accademia di Belle Arti in Rome. There she met Alberto Burri, with whom she began a relationship that would influence her work for the rest of her life and they travelled together in Italy during 1948. The pair would create works in response to the each other throughout the 1950s and 60s while Burri rose to international recognition. Blow faced the challenge of not only establishing herself as a woman artist in the 1950s but also as an abstractionist. The first sale of any of her works was to Roland Penrose, a founder of the Institute of Contemporary Arts, which proved to be a pivotal moment in her career.

Blow's success further changed when the leading London gallery, Gimpel Fils, began representing her work from 1951.]]

After her structured training at Saint Martin's, Blow was influenced by Nicolas Carone and his approach to colour and space. He in turn had been influenced by Hans Hofmann. Blow was also influenced by Alberto Burri, who was progressing towards abstract art informel, using materials such as sacking. Blow and Burri started a relationship, and travelled together throughout Italy during 1948, influencing each other's styles. It was through him that she started to use "poor" non-art materials, as seen in her painting Space And Matter in which she used liquid cement plus chaff and charcoal, She was one of the most original woman painters in Britain, challenging the "'macho' cult" surrounding abstract art.

Blow's work was widely exhibited during her lifetime. Notable exhibitions of her work include sales made to the Museum of Modern Art and the Tate Gallery, the 1958 Venice Biennale, the 1960 Guggenheim International Award (which she won), the 1961 Liverpool John Moores University exhibition and at the Victoria and Albert Museum. Despite moving to St Ives in the 1990s, Blow continued working in London, participating in the Royal Academy's Summer Exhibitions and being honoured with a retrospective in the newly completed Sackler Galleries in 1994. In 1995, she completed her "only large scale experimentation with glass", In 2001–2002, Space and Matter, became the title of an exhibition of Blow's work at Tate St Ives.

Later life

Blow lived in a flat in South Kensington, London, since the 1960s but was forced to move due to rising rents.