PBr7 Natural Iron Oxide (Siennas, Umbers)
Natural iron oxide.
155 tubes from 20 of 24 paint lines contain PBr7. 93 are made from PBr7 alone, which is the closest match when you're switching brands.
- Toxicity
- No toxic metal Not one of the toxic-metal pigments. As with any paint, keep it out of your mouth and don't sand or spray it.
- Drying
- Fast Umbers contain manganese and are among the fastest-drying oil colors; siennas are a little slower.
About PBr7
History
Natural iron-oxide earths, the siennas and umbers, have been used since prehistoric times. Burnt versions are the raw earths roasted, which turns them warmer and redder.
In mixes
Low-key and permanent. Burnt sienna with ultramarine is a classic mix for greys and darks; raw umber is a common choice for fast-drying underpaintings and for dulling a color without muddying it much.
Drying speed is typical for linseed oil; tubes ground in safflower or poppy oil, or with driers added, will differ. These are general notes on the pigment, not on any one brand.
Purest PBr7, by brand
The best single-pigment PBr7 tube from each line, ranked: artists' grade first, then lightfastness, then how firmly the pigment listing is confirmed. Ties are listed alphabetically.
- Art Spectrum Raw SiennaSeries 1 · LF I · Semi-transparent
- Blockx Cassel EarthSeries 2 · LF I · Semi-opaque
- Gamblin Burnt SiennaLF I
- Grumbacher Burnt UmberSeries 1 · LF I · Opaque
- Langridge Burnt SiennaSeries 2 · LF I · Opaque
- M. Graham Burnt SiennaSeries 1 · LF I · Semi-transparent
- Michael Harding Raw SiennaSeries 1 · LF I · Semi-transparent
- Old Holland Raw UmberSeries A · LF I
- W&N Artisan Burnt UmberSeries 1 · LF I · Transparent
- W&N Artists' Brown OchreSeries 1 · LF I · Semi-transparent
- W&N Griffin Burnt UmberSeries 1 · LF I · Transparent
- Williamsburg Raw UmberSeries 1 · LF I · Semi-opaque
- Holbein Burnt SiennaSeries A · LF I · Semi-opaque
- Lukas 1862 Raw SiennaSeries 1 · LF I
- Da Vinci Raw SiennaLF not rated · Semi-transparent
- Maimeri Puro Raw Sienna LightLF not rated
- Vasari Burnt SiennaLF not rated · Opaque
- Van Gogh Burnt SiennaSeries 1 · LF I · Semi-transparent · student grade
- W&N Winton Burnt UmberSeries 1 · LF I · Opaque · student grade
- Georgian Raw UmberLF not rated · student grade
Not sold here by: Rembrandt, Schmincke Mussini, Cobra, Art Creation.
Made from PBr7 alone
Mixtures that contain PBr7
Brands: Art Spectrum, Blockx, Da Vinci, Gamblin, Georgian, Grumbacher, Holbein, Langridge, Lukas 1862, M. Graham, Michael Harding, Maimeri Puro, Old Holland, Vasari, Van Gogh, Williamsburg, W&N Winton, W&N Artists', W&N Artisan, W&N Griffin.