Raw Umber is the fastest-drying colour in oil painting, and the Old Masters knew it. Its manganese content acts as a natural drying agent, making Raw Umber set significantly faster than most other oil paints. This unique property has made it the standard first-layer colour for lean underpaintings for centuries, allowing the painter to develop tonal structure quickly and paint over it within a day or two. Art Spectrum Studio Blend Oil Raw Umber uses PBr7 (natural iron oxide with manganese) to deliver this cool, grey-brown in a semi-transparent paint that is as valuable as a practical studio tool as it is as a colour in its own right.

What Makes This Colour Special

The colour temperature of Raw Umber is what distinguishes it from Raw Sienna most clearly. Where Raw Sienna is warm and golden (orange-biased), Raw Umber is cooler and greyer (green-biased), with a quality sometimes described as greenish-brown. This cooler quality makes Raw Umber more useful than Raw Sienna for painting shadows, for dark neutral passages, and for surfaces that read as aged, dirty, or cool-toned rather than warm-lit. It is also more effective than black for darkening colours without shifting them toward blue, which is the tendency of Carbon Black and Ivory Black.

For the Old Masters' layered painting technique, Raw Umber served a specific and essential function. The initial lay-in of a composition was typically done in Raw Umber, thinned very lean with solvent, with no oil. This established the full tonal range of the painting in a single, fast-drying, semi-transparent layer. Because Raw Umber dries faster than almost any other oil colour, the painter could return within a day or two and begin applying subsequent, fatter colour layers over the completed underpainting. This systematic approach, from lean Raw Umber underpainting to increasingly fat colour layers above, is the technical basis for the exceptional durability and tonal depth of Old Master oil paintings.

Why Art Spectrum Studio Blend Oil Belongs on Your Palette

• The fastest-drying oil colour. Manganese content makes Raw Umber dry significantly faster than any other colour on the palette. For underpainting and multi-layer work, this is a major practical advantage that no other colour provides.
• The cool neutral darkener. Where black overshoots in value and Paynes Grey cools to blue-grey, Raw Umber darkens and neutralises in a cooler-than-Raw-Sienna, warmer-than-grey way that mixes into most colours naturally without pulling them in an unwanted direction.
• ASTM I lightfastness. One of the most permanent pigments in existence. Iron oxide earths have been stable for tens of thousands of years and will not change under any normal conditions.
• The Old Masters' underpainting colour. Lean Raw Umber underpainting is a technique with a six-hundred-year track record. For painters working in a structured, multi-layer approach, Raw Umber is the correct starting point.
• Australian-made since 1966. Art Spectrum has produced artists' materials from their Epping, Victoria facility for over six decades.

Getting the Most Out of This Tube

For underpainting, thin Raw Umber only with mineral spirits or odourless turpentine, without any additional oil, to keep the first layer as lean as possible. Use a large flat brush to block in the shadow masses and tonal structure of the composition, leaving the lighter areas as the bare primed ground. Work quickly, as this lean layer dries fast and can be reworked or wiped back within the first session. Once completely dry, subsequent layers with added oil can be applied over the underpainting safely according to the fat-over-lean rule.

As a mixing colour, Raw Umber is the most useful tool for knocking back the intensity of chromatic colours that are reading as too bright or too saturated in context. A very small amount of Raw Umber added to an over-bright green, blue, or red will lower the chroma and value simultaneously, moving it toward the neutral, atmospheric tones that most observed subjects display in practice. This technique of adding Raw Umber to reduce chroma is faster and more controllable than mixing a complementary colour for the same effect.

Mixed with Titanium White, Raw Umber gives the range of cool, neutral warm-greys that describe weathered wood, aged concrete, shadow on white surfaces, and the grey-brown of dry Australian bush scrub in winter. The slight warmth of the earth base prevents these greys from reading as cold or clinical, keeping them naturalistic even in passages that are essentially neutral in colour.

About Art Spectrum Studio Blend Oil: Melbourne Made Since 1966

Art Spectrum has been manufacturing artists' materials in Epping, Victoria since 1966. The Studio Blend Oil range is the rebrand of the former Art Prism range, with fresh new packaging and artwork. The formula is unchanged: same pigments, same linseed oil base, same manufacturing standards. It is a studio-grade oil paint designed for working artists who want reliable, lightfast colour at a practical price. The 26-colour palette covers the complete mixing spectrum and is fully compatible with all Art Spectrum oil mediums and varnishes.

Art Shed Online is an authorised Australian stockist of Art Spectrum products. All Art Spectrum Studio Blend Oil colours are sourced through official distribution channels. We ship Australia-wide.