Category:Articles using invalid color names

When previewing a page in this category, a warning will describe the invalid color names used on the page. If no warning appears, it is because the category is being introduced to the page via Template:Nomenclature. In this case, it is a Data:Translations subpage that uses the template incorrectly. You can use Special:ExpandTemplates to find out which. Put the name of the article as the context title and  as the wikitext. Search for this category name in the Result section. The category name will appear next to the problematic translation reference. The translation subpage will display the usual warning.