Chromium oxide in paints makes the colour of paint

Chromium oxide, specifically chromium(III) oxide (Cr2O3), is a widely used inorganic pigment known for its distinct green color. It is frequently referred to in the industry as "chrome green" or "chromium oxide green". This compound is highly valued in paint manufacturing due to its exceptional chemical stability, lightfastness, and resistance to weathering [1]. It is an odorless, bright green powder that remains insoluble in water and stable at high temperatures, making it ideal for industrial applications such as painting military vehicles and coloring glass or ceramics. While other chromium compounds can produce various colors, the specific oxide Cr2O3 is the primary single-component pigment used to achieve a durable green hue in paints and inks [1].

Sources

1. [1] https://www.sciencedirect.com/science/article/abs/pii/S0272884213010663