Humbrol Colors Model Paint Conversion Chart (from RGB to Hexidecimal).

Tools, Techniques, and Reference Materials Reference Materials
1

http://www.aoou52.dsl.pipex.com/Models/humbrol-standards.htm

http://www.chassis-plans.com/paint_fed-std-595.html

http://ipmsstockholm.org/colorcharts/colorcharts.asp