Cobalt Warm Grey Pigment

Description

Cobalt Warm Grey (PBk25) is a handmade single pigment cobalt nickel gray composed of a cobalt nickel composite oxide with a warmer tone than Cobalt Cool Grey. It produces a warm gray with a soft, stone like character and a deep, muted masstone. Compared to carbon based blacks, this pigment feels more mineral and atmospheric, offering a quieter chroma and a more natural, less inky appearance on the page.

In use, Cobalt Grey gives a controlled, elegant gray ideal for overcast skies, distant mountains, mist, metal, stone, and subtle shadow work in landscape and figure painting. It has moderate to strong tinting strength without the harshness or overpowering density of many modern blacks, making it easy to nudge mixtures cooler or darker without overwhelming other colors. It mixes beautifully with blues for stormy neutrals, with earths for sophisticated charcoal grays, and with reds and violets for complex, smoky mauves and shadow tones that stay refined rather than muddy.

This cobalt nickel oxide pigment is calcined at high temperature, making it chemically inert, heat resistant, and highly resistant to acids and alkalis. In artist's colors it offers a restrained, mineral gray that can function as a primary neutral on the palette, an alternative to lamp or ivory black, or a quiet mixer for palettes that favor subtlety, atmosphere, and tonal control.

History

Modern cobalt nickel gray pigments emerged in the 20th century as part of a broader family of inorganic black and gray pigments designed for industrial coatings. By calcining cobalt and nickel oxides together at elevated temperatures, chemists created a stable composite oxide with a cool gray to black tone and excellent resistance to weathering, heat, and corrosion. These materials were used in protective barrier paints for metal structures, machinery, and architectural applications where durability, adhesion, and long term color stability were critical.

As interest grew in inorganic pigments with unique handling and chromatic behavior, cobalt nickel gray (PBk25) gradually found its way into artist materials, particularly in specialty pigment lines and select watercolor ranges. Artists valued its quiet, cool gray hue and its ability to create nuanced neutrals without the stark, sooty look of carbon blacks. Today, Cobalt Grey remains an uncommon but appreciated pigment among painters who want a refined, mineral gray with a distinct personality and a long history of technical reliability.

Pigment Information

Pigment Type: Synthetic (Inorganic) cobalt nickel composite oxide
Source: Cobalt and nickel oxides calcined at high temperature
Origin: Global industrial (modern ceramic pigment)
Suitable Mediums: Watercolor, Oil, Tempera, Acrylic, Lime / Fresco, Ceramic and cement applications
Lightfastness: Excellent
Opacity: Semi-opaque to opaque
Other Names: Cobalt Grey, Cobalt Nickel Gray, Cobalt Nickel Black (PBk25)
Color Index Code: PBk25

Health and Safety

• For art use only. Not for cosmetic, food or children's use.
• Keep out of reach of children and pets. Do not eat, drink or smoke while working.
• Avoid creating or breathing dust. Work in a ventilated area and wear a NIOSH approved dust respirator (P100 or better) when handling dry pigment.
• Wear gloves and eye protection. Wash hands and work surfaces after use, and never rinse pigment into drains.
• Do not spray apply, sand or burn.
• If swallowed or if you feel unwell, contact a poison control center (U.S. 1-800-222-1222) or a doctor.
• Safety Data Sheet available on request.

Caution: Contains cobalt. May cause an allergic skin reaction. May cause allergy or asthma symptoms if dust is inhaled. Avoid breathing dust and repeated skin contact. Do not rinse into drains.