RTE "foreColor" doesn't work. Just shows an empty box

When I create a RTE and attach via JavaScript, if I try to add font color via “foreColor” (which wysihat.js says is a valid command), it shows a shrunken blank box next to link that doesn’t do anything. “forecolor” also doesn’t work.

$( myTextArea ).addClass( "WysiHat-field" )
    .wysihat( { buttons: ["bold", "italic", "link", "foreColor",["headings"]] } );