This page is designed to link to some colour reference tool web sites to communicate a colour by reference number or common name. This method is not as accurate as sending an actual colour swatch but may be good enough for most needs.
A good colour reference http://www.ficml.org/jemimap/style/color/wheel.html record the hex value of the required colour "#??????"
http://en.wikipedia.org/wiki/List_of_colors
Colour common names http://msdn2.microsoft.com/en-us/library/aa358802.aspx
http://milov.nl/iambald/24.html record the hex value of the required colour "#??????"
Note - if any of these links go stale (no longer work), or you know of a better reference site please send a brief email.