Iron oxide pigments: Extraction
Ancient earth colours versus pigment made from steel waste
What this tab covers How it is mined, drilled or grown, and processed into a tradeable form: the main methods compared, their unit economics, by-products, and the companies that do this work globally and in India.Iron oxide pigments come in two forms. Natural pigments are earths such as ochre, sienna and umber, plus hematite and micaceous iron oxide. They are dug from shallow deposits, washed, dried and finely milled. Synthetic pigments are precipitated from iron salts, often from steel-industry pickling liquor or scrap, then calcined to set the shade. Synthetics give brighter, more consistent colour and make up over 98% of US imports. In the US, two companies mine natural material in Alabama and Georgia, and five firms process and sell about 32,000 t of finished pigment.
Iron oxide pigments come by two routes. Natural pigments are mined earths such as ocher and umber, washed, milled and sometimes calcined. They are cheap but less pure. Synthetic pigments are made in chemical plants from scrap iron, steel pickling liquor or iron salts, giving brighter and more consistent shades. Synthetics now dominate trade: less than 2% of US imports are natural. China makes over half of world synthetic supply (LANXESS, 2017). LANXESS runs the largest single plant.
Methods compared
| Method | Share of supply | Typical scale | Recovery / efficiency | By-products | Unit cost |
|---|---|---|---|---|---|
| Natural earth pigments (ocher, umber, sienna, micaceous iron oxide) | less than 2% of US imports (USGS); India's 3.4 Mt of crude ocher (2025) is the largest reported output | Cyprus 22,000 t, Italy 32,000 t, Spain 19,000 t, Pakistan 80,000 t (2025, USGS) | n/a | n/a | not published |
| Synthetic precipitation (Penniman process) | most synthetic red and yellow supply; China over 50% of global synthetic output (LANXESS, 2017) | LANXESS Ningbo plant designed for 25,000 t/yr of red pigment, started Q1 2016, cost about EUR 55 million | n/a | n/a | US average unit value of finished pigment $1.90/kg (2025e, USGS, natural and synthetic) |
| Synthetic co-production and calcination (Laux and similar routes) | not published | LANXESS Krefeld-Uerdingen capacity 280,000 t, planned to rise by about 23,000 t by 2019; Jinshan, Shanghai 38,000 t/yr yellow and black | n/a | aniline (Laux process) | not published |
How each method works
Natural earth pigments (ocher, umber, sienna, micaceous iron oxide)Ore is quarried, washed, dried, milled and classified; heating (calcining) turns yellow ochers red. Micaceous iron oxide is milled to keep its flaky shape.
Cheap and natural; duller shades and variable quality.
USGS MCS 2026, Iron Oxide Pigments Synthetic precipitation (Penniman process)Scrap iron is dissolved and oxidised in the presence of iron oxide seed crystals in tanks, growing pigment particles of controlled size and shade, then filtered, washed, dried and milled.
Bright, consistent shades; needs wastewater treatment.
Process Worldwide, Jan 2013; European Coatings, Mar 2017; USGS MCS 2026 Synthetic co-production and calcination (Laux and similar routes)In the Laux process iron reduces nitrobenzene to aniline and the iron is converted to pigment; other plants calcine iron salts or oxides to red and black shades.
Very large scale and quality; tied to chemical co-product economics.
European Coatings, Mar 2017; Process Worldwide, Jan 2013 Unit economics are indicative ranges from the sources named; costs vary widely by deposit, region and year.By-product supply
Synthetic pigments often use by-product iron sources such as steel scrap and pickling liquor, and the Laux process makes pigment alongside aniline, so some supply follows steel and chemicals output rather than pigment demand.
Who does it: global
| Company | Country | Activity | Volume | Year | Source |
|---|---|---|---|---|---|
| LANXESS Capacity was 375,000 t before the expansion; later figures not found. More than 13 Mt of pigment made at Krefeld since 1926 (bft International). | Germany | synthetic iron oxide pigments (Bayferrox); plants in Krefeld-Uerdingen, Ningbo, Jinshan and Porto Feliz | 400 kt/yr iron oxide pigment capacity (planned) | 2019 | European Coatings, Mar 2017 |
| Chinese synthetic pigment makers Company volumes not published; China makes over 50% of global synthetic supply and supplied 44% of US synthetic imports in 2021-24 (USGS). | China | synthetic iron oxide pigments | not published | n/a | European Coatings, Mar 2017 (LANXESS data) |
| US processors (five companies, eight operations) USGS does not name the companies; sales worth about $60 million. | US | natural and synthetic pigment processing | 32 kt sold or used | 2025 | USGS MCS 2026, Iron Oxide Pigments |
Who does it: India
India is the largest reported producer of crude ocher, about 3.4 Mt in 2025 with 37 Mt of reserves (USGS). No Indian company volumes were found for natural or synthetic pigment.