In the Wiki Renderer there is a tag that allow to specify the colour for the text in-between the tags.
So you can use {color:pink} or {color:000000} to manipulate a content of field.

Although, there isn't any description in the documentation what colours are supported by the tag.

I'm assuming that the 216 web safe colours can be used (http://en.wikipedia.org/wiki/Web_colors).

Recently, there was a case in SAC where user requested such an improvement in our documentation.