RAL 7011 Iron Grey

RAL 7011 Iron Grey (#434B4D) is a dark, cool blue-grey from the RAL Classic system named after the natural grey of cast iron. This dark, metallic-adjacent grey evokes industrial strength, raw metal, and heavy engineering. It's widely used in machinery, structural metalwork, and premium industrial design for its authentic, material-referencing character.

Dark cyans and deep aquas convey depth, reliability, and technical mastery. They carry the trustworthiness of blue with a modern, slightly warmer edge from their green component. These tones suggest specialized expertise and sophisticated engineering.

Dark cyan works for cybersecurity brands, developer platforms, and data infrastructure companies. It creates striking dark-mode accents and terminal-style interfaces that feel technical yet approachable. Pair it with lighter cyan highlights and neutral grays for a layered, depth-rich design system.