The easiest way to alter properties is with the Text Properties menu. You can get to this menu from the Edit menu in the menu bar (Menu Bar), or with C-mouse-2 (Menu Mouse Clicks). Some of the commands in the Text Properties menu are listed below (you can also invoke them with M-x):

Remove Face Properties

Remove face properties from the region (facemenu-remove-face-props).

Remove Text Properties

Remove all text properties from the region, including face properties (facemenu-remove-all).

Describe Properties

List all text properties and other information about the character following point (describe-text-properties).

Display Faces

Display a list of defined faces (list-faces-display). Faces.

Display Colors

Display a list of defined colors (list-colors-display). Colors.

@noindent The other menu entries are described in the following sections.