I imported some text and graphics from a previous version of a book, and now I have variations on some colors (Pantone 210) that I cannot delete (greyed out). I tried to merge the colors, but could not. Any suggestions?
If an imported graphic uses a spot color, that color is added to InDesign's Swatches panel—any variation in the name would be a mismatch and a new color would be created. You can open the graphics and fix the name, or you can use Ink Manger to Alias the unwanted or misnamed colors to the correct spot color. If a spot color is used by a placed or pasted graphic it can't be deleted from the swatches list.
The swatch could also be included in Para/Char Style(s)
You could create a Preflight to look for spot colors which would take you to any page using a graphic as rob mentioned.
Many thanks Rob and Flavin. Aliasing the colour in Ink Manager will do the trick. Much quicker than editing all of the graphics (nearly 400 of them in the book).