Colour Index International

Color Index International is like a big book that helps people know about the different colors in things like paints and dyes. It has lots of pages that each describe a different color and tell people what it is made of, like what chemicals are used to make it. This helps people who want to make things like paint or clothes know what colors are available and how to make them. It's kind of like a giant crayon box, except instead of just picking a color, people can learn about what makes the color and how to create it themselves!