Usage:
( colordef | colourdef ) color_name  red green blue [ alpha ]

Usage:
( colordef | colourdef ) color_name  existing_color_name

Usage:
( colordef | colourdef ) existing_text_color_name

Colordef can be used to define a new color or to change the definition of an existing color. See also: color, bondcolor, ribcolor, ribinsidecolor, modelcolor, scolor, background, the Color Editor, coloring

The color_name can be:

• an arbitrary name not yet associated with any color (can contain letters, digits, underscores)
• a name defined previously with colordef
• a built-in color name, but only those without spaces. However, redefining built-in colors is generally not recommended because of the potential for confusion. For example, "red" could be redefined to mean some other color. A more reasonable use is to change the color-by-element scheme, e.g., to assign green instead of gray to carbons (see the last example)

The existing_color_name can be any color name that specifies a single color. The name colorpanel, fromeditor, or editor can be used to save the current Color Editor color to a name before further changes are made.

Examples:

colordef lilac 0.5 0.5 1.0
colordef transparent_red 1 0 0 .4
colordef same_transparent_red 1,0,0,.4
colordef puce #551129
colordef raisin puce
colordef myblue colorpanel
colordef C green

A convenient way to define colors automatically is to place colordef commands in a startup command file (see the Command Line preferences). Color definitions are also saved in sessions.