Q: How do I remove a Tag from a document in Finder?

Howdy Richtim,

Thanks for using the Apple Support Communities.

If you'd like to un-tag an item, then please follow the directions below.

• Un-tag an item: Control-click it or tap it with two fingers, then choose Tags. Select the tag you want to remove, then press Delete. 

  To remove every instance of a tag from all files and folders, choose Finder > Preferences, then click Tags. Put the pointer on a tag, Control-click or tap with two fingers, then choose Delete Tag.

OS X Mavericks: Tag files and folders with colors and labels

Take care.