Currently the default style of Placeholder is Italic and tiny text size. I know I can do the code below, which does what I want:

"\!(*TagBox[FrameBox[StyleBox[\"\\""<>"andrew"<>"\\"\",FontSize->12,FontWeight->Plain,FontSlant->Plain,StripOnInput->False]],\"Placeholder\"])"

However, its still grey text which is often hard to read, But when I try this:

"\!(*TagBox[FrameBox[StyleBox[\"\\""<>"hello"<>"\\"\",FontSize->12,FontWeight->Plain,FontSlant->Plain,FontColor->GreyLevel[0],StripOnInput->False]],\"Placeholder\"])"

I get an error msg:

The specified setting for the option FontColor cannot be used.

How do I set correctly the fontcolor to Black or a much darker Grey?

Thanks for helping.