UK Titles Editorial
The small material description beneath a painting can change how you look at it. Oil on canvas, tempera on panel and watercolour on paper name different combinations of paint and the surface carrying it. Reading those combinations gives the picture a physical structure as well as a subject: colour has been applied to something, often with preparation in between.
Separate the paint from its support
The National Gallery defines a support as the material or object on which a painting is made. Wood, canvas and paper describe that foundation. They do not, by themselves, identify the paint. The Gallery notes that both oil and tempera have been used on different supports, including wooden panels and canvas.
Paint itself brings together pigment, which supplies colour, and a binder that holds the pigment particles together. The Gallery’s binder glossary gives drying oil, egg yolk and animal glue as examples found in its paintings. A binder belongs to the paint formulation; it is different from the material underneath.
This distinction also matters in catalogues. The Getty’s cataloguing guidance separates the roles of medium and support. In a description such as oil on oak, oil identifies the painting medium and oak identifies the support. More specific wording adds information: oak says more than wood, just as a named kind of paper says more than paper alone.
A wooden panel provides a rigid foundation
A panel is a rigid painting surface, although the word is broader than wood: the National Portrait Gallery’s definition also includes metal and card. Its account explains that panels were the leading supports for easel painting in Britain until canvas became dominant in the seventeenth century. That is a broad historical pattern, rather than a way to assign a date to an individual picture.
A wooden panel need not be one uninterrupted board. The National Gallery’s panel-painting glossary describes both single planks and assemblies of several planks, joined with materials such as glue and dowels. It identifies poplar as especially common in Italian Old Master panels and oak in northern European ones, while recording many other woods. A description of the particular timber can therefore be meaningful; panel alone leaves that detail open.
Canvas is a woven support
Canvas names cloth, rather than a type of paint. The National Portrait Gallery describes stretched woven fabric, usually linen, but also cotton or synthetic material such as polyester. It is associated with oil painting and is also used for acrylics. Canvas on a label consequently does not mean that the paint must be oil.
There is structure within that cloth. The Museu Nacional d’Art de Catalunya’s explanation describes the crossing warp and weft threads of canvas. These terms refer to the fabric underneath the painted image. They help separate two kinds of information that can otherwise become blurred: the construction of the support and the artist’s application of paint over it.
The ground changes the starting surface
Support and paint do not always meet directly. A ground is a preparatory layer applied to the support. According to the National Gallery’s account of grounds, its colour and tone can influence the colours and tonal relationships of the paint above. A painting can therefore begin on a coloured preparation rather than an apparently neutral white surface. The Gallery notes reddish grounds used by Poussin and brownish ones favoured by Rembrandt.
For historical wooden panels, that preparation is often gesso. The Gallery’s historical explanation of gesso describes gypsum held in an adhesive binder, producing a smooth painting surface on wood; it also records its occasional use in priming canvas and notes the chalk-based grounds used north of the Alps. Here, ground and priming concern preparation. They do not replace the separate descriptions of the support and the paint.
Paper contributes to the painted effect
Paper can participate visibly in a watercolour rather than simply disappear beneath it. The Metropolitan Museum of Art’s technical explanation describes how the brightness of the underlying sheet contributes to transparent colour. It also explains that gelatin sizing makes paper less absorbent. Sizing here means a treatment affecting the sheet’s response to the medium, rather than its dimensions.
Texture matters too: the same museum describes dry-brush marks passing across a textured sheet’s raised surface while leaving hollows unpainted. A pale highlight need not be a patch of white paint. A British example appears in the V&A’s discussion of John Constable’s 1830 cloud study: he left paper bare to represent lighter areas. That is a specific explanation of this work, rather than a rule for every watercolour.
Familiar combinations have exceptions
The V&A explains watercolour as pigment with a binder, usually gum arabic, diluted with water. When the water dries, the binder attaches the pigment to the support. The museum also demonstrates that watercolour can be thick and opaque, so the name does not promise one transparent appearance.
Nor is paper reserved for watercolour. In a 2014 report on examining Constable’s oil sketches, V&A conservators describe paper supports, sometimes made from several sheets laminated together, with coloured grounds beneath the oil paint. The example brings all three descriptions together: paper support, prepared ground and oil medium. A material label opens that inquiry; it does not settle every question about how a painting was made.
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