How to best communicate color names to users more clearly

Many times in using general color names in communication, i.e. Red and Green, users are confused when the color is a non-pure form of the color.

For Example, in referring to the Red-ish color of the error box on Ask Ubuntu:

There is much debate as to what to classify the color as, Here are some transcripts of conversations had about these colors of user interaction:

http://chat.stackexchange.com/rooms/201/conversation/salmon-2

http://chat.stackexchange.com/rooms/201/conversation/pink-red

In the second this was even a problem for communicating the location of a feature.

What are some ways to overcome this limitation of using abstract and descriptive colors.

I know we can refer to the color as a value ex C04848 as a hex value to be specific, but value systems seem not to immediately convey the color to the user.