When Excel Prints Gray or Light-gray Colored Text in Black

(ver. MS-Office 2013)

File
Print
Page Setup (<- under the printing options)
Sheet tab
Option button (<- will lead you to Printing Preferences, but don't go there via Control Panel)
Print Quality tab
Advanced button
Print colored texts and borders in black to Disabled (<- this text is not exactly same to this, anyway disable it)

Ok, Ok, Apply, Ok, ... boom!