PR101
Synthetic Iron Oxide / Mars Red
- Chemistry
- Iron oxide (Fe₂O₃)
- Origin
- Synthetic.
- History
- A family of permanent, opaque reds and violets ranging from earthy to vivid.
- Toxicity
- Non-toxic.
Synthetic Iron Oxide / Mars Red (PR101) is Iron oxide (Fe₂O₃). In our watercolour range it is opaque, yes granulation, excellent lightfastness.
- Transparency
- Opaque
- Granulation
- YES
- Staining
- Medium
- Lightfastness
- Excellent
What is PR101?
PR101 (Synthetic Iron Oxide / Mars Red) is Iron oxide (Fe₂O₃). Synthetic..
What is the chemistry of PR101?
PR101 is Iron oxide (Fe₂O₃).
Is PR101 toxic?
Non-toxic.
Is PR101 lightfast?
In the Michael Harding range, colours using PR101 are rated excellent for lightfastness.
Is PR101 transparent or opaque?
PR101 is opaque.
Does PR101 granulate?
In watercolour, PR101 is granulating.
Which Michael Harding colours use PR101?
PR101 appears in 16 Michael Harding colours: Indian Yellow Red Shade, Herculane Red, Madder Brown, Hookers Green, Olive Green, Transparent Oxide Red and 10 more.
The story of PR101
Permanent, opaque and fast-drying - the modern, predictable face of the earth-red family.
How it is made
Mars reds are precipitated from iron salts under controlled conditions, giving pure, consistent oxides free of the impurities of natural earths. Milled in oil they produce opaque, fast-drying, fully permanent reds.
In the hands of the masters
The natural iron oxides - red ochre, bole - are among the oldest pigments, found in prehistoric cave art and the flesh tones of every era. The synthetic Mars versions give modern painters that same permanence with cleaner, brighter hues.
Michael Harding colours using PR101
16 colours across both rangesLightfastness: ExcellentOil Colours containing PR101
8 colours
No. 204 Indian Yellow Red Shade
- Pigment
- PY83, PR101
- Type
- Organic
- Lightfastness
- Excellent
- Oil Content
- High
- Tint Power
- Average
No. 138 Herculane Red
- Pigment
- PR101
- Type
- Inorganic
- Lightfastness
- Excellent
- Oil Content
- Low
- Tint Power
- Average
No. 317 Madder Brown
- Pigment
- PR202, PR101
- Type
- Organic/Inorganic
- Lightfastness
- Excellent
- Oil Content
- High
- Tint Power
- Average
No. 238 Hookers Green
- Pigment
- PG36, PR101, PY74
- Type
- Organic/Inorganic
- Lightfastness
- Excellent
- Oil Content
- High
- Tint Power
- High
No. 237 Olive Green
- Pigment
- PR101, PY74, PB15.3
- Type
- Organic/Inorganic
- Lightfastness
- Excellent
- Oil Content
- Average
- Tint Power
- High
No. 220 Transparent Oxide Red
- Pigment
- PR101
- Type
- Inorganic
- Lightfastness
- Excellent
- Oil Content
- Average
- Tint Power
- High
Watercolours containing PR101
8 colours
No. W204 Indian Yellow Red Shade
- Pigment
- PY83, PR101
- Lightfastness
- Very Good
- Tint Power
- 3
No. W163 Hookers Green
- Pigment
- PG36, PR101, PY180
- Lightfastness
- Excellent
- Tint Power
- 3
No. W162 Olive Green
- Pigment
- PR101, PY180, PB15.3
- Lightfastness
- Excellent
- Tint Power
- 4
No. W125 Burnt Sienna
- Pigment
- PR101
- Lightfastness
- Excellent
- Tint Power
- 4
No. W122 Pozzuoli Red
- Pigment
- PR101
- Lightfastness
- Very Good
- Tint Power
- 3
No. W155 Herculane Red
- Pigment
- PR101
- Lightfastness
- Excellent
- Tint Power
- 3
| Colour | Medium | Transparency | Lightfastness | Granulation |
|---|---|---|---|---|
| Indian Yellow Red Shade No. 204 | Oil | Transparent | Excellent | — |
| Herculane Red No. 138 | Oil | Semi-Opaque | Excellent | — |
| Madder Brown No. 317 | Oil | Transparent | Excellent | — |
| Hookers Green No. 238 | Oil | Semi-Transparent | Excellent | — |
| Olive Green No. 237 | Oil | Semi-Transparent | Excellent | — |
| Transparent Oxide Red No. 220 | Oil | Transparent | Excellent | — |
| Venetian Red No. 122 | Oil | Semi-Opaque | Excellent | — |
| Indian Red No. 123 | Oil | Semi-Opaque | Excellent | — |
| Indian Yellow Red Shade W204 | Watercolour | Semi-Transparent | Very Good | NO |
| Hookers Green W163 | Watercolour | Semi-Transparent | Excellent | YES |
| Olive Green W162 | Watercolour | Semi-Opaque | Excellent | YES |
| Burnt Sienna W125 | Watercolour | Transparent | Excellent | YES |
| Pozzuoli Red W122 | Watercolour | Semi-Transparent | Very Good | YES |
| Herculane Red W155 | Watercolour | Opaque | Excellent | YES |
| Indian Red W123 | Watercolour | Semi-Opaque | Excellent | YES |
| Dark Morellone Earth W159 | Watercolour | Opaque | Excellent | YES |
Pigments in the same family
Complementary pigments to mix with PR101
Opposite-family pigments that pair cleanly with PR101 for neutrals, shadows and chromatic greys.
Open the Mixing Studio →