I am sorry to have to ask what seems to me a basic question.

How do you remove a texture map?

For example, I accidently clicked on texture map for Luminosity instead of the Color and added a Texture map. I can't seem to turn off the Blued T now. I can set the image to 'none' and that seems to stop the mapping from occurring but that bloody T is blued as if a Texture map is being used.

I must be missing something obvious, right?