function my_mce4_options($init) {

    $custom_colours = '
        "8D9C35", "vert",
        "812437", "bordeau",
        "EF9CAC", "Rose",
		"E5262A", "rouge",
		"382848", "noir-mauve",
		"FC6050", "orange"
		

    ';

    // build colour grid default+custom colors
    $init['textcolor_map'] = '['.$custom_colours.']';

    // change the number of rows in the grid if the number of colors changes
    // 8 swatches per row
    $init['textcolor_rows'] = 1;

    return $init;
}
add_filter('tiny_mce_before_init', 'my_mce4_options');