RAL 5021 Water Blue

RAL 5021 Water Blue (#256D7B) is a medium-deep teal-blue from the RAL Classic system named after the clear color of surface water. This vivid, naturally aquatic blue-green is used in water infrastructure branding, environmental reports, and marine product design for its immediate, legible water-association across European specifications.

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.