A colour palette is a [[data tiddler|DataTiddlers]] that supplies a [[CSS]] colour value, such as ''yellow'' or ''#fe0'', for each of several colour names, like this:
By convention, each [[theme|Themes]] provides a default colour palette in the tiddler [[$:/config/DefaultPalette]]. Thus, setting the tiddler [[$:/theme]] to the string `$:/config/DefaultPalette` will revert to the palette packaged with the current theme (as long as it hasn't been redefined, since it is a shadow tiddler).