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RAL COLOURS – Innovation and Reliability. Worldwide. RAL is the global language of colour. Since 1927, we have clearly defined standards to each colour tone using colour values, numbers and names. Our worldwide colour standards ensure reliability and provide clarity for colour selection. Colours are our Business. RAL provides colour users in architecture, industry, craftsmanship and design with more than 2,500 colour samples. Our product range includes different colour collections and systems.