The Web has scads of material on hex colors. Here is a sample of theory, practical colour charts and pages that let you try out your colours --
- Online Resources
- Web Colors from Wikipedia
- HTML Colors from w3schools.com
- Named Colors
- Hexadecimal Colors - an explanation and a slider that lets you try out colours
- Hexadecimal Colour Values - same idea as above but less aimed at younger kids
- RGB and Hex Converter/Color Finder
- Hex Color Code Chart & Generator
- Hexadecimal Color Chart
- 216 Web Safe Color Chart
