Guiskin: how to change font color?

Hello! I'm getting lost in Guiskins.. I have two gui skin, one for normal text/tabs, one for selection (mouse over, up/down arrows..). I'm not using script, but an external framework, so i'd like to use text settings in guiskin directly. The problem is, i think to have tried to change every combination of options, but i cannot change the text color displayed by the guis skin. Anyone could point me which are the most specific settings text colors in guiskin tab in ispector?

Thanks in advance, Kae