German Standard colours. Cross references between RAL and Humbrol colours are available here.
An internationally recognised system for colour selection, specification, communication and control of colour in architecture, design, marketing, manufacturing, education and research.
RAL is a color space system developed in 1927 by Reichsausschuß für Lieferbedingungen (und Gütesicherung)—German for Commission for Delivery Terms and Quality Assurance, nowadays called Deutsches Institut für Gütesicherung und Kennzeichnung e.V. RAL started off with only 40 colours, but has since expanded to cover over 1,900. That color system is mainly used to describe Paint colors.