[Konstantinos]

pawn Код:

new
    color_str[ 7 ] = "FF0000"
;

// ---

new
    hex_str[ 11 ],
    color
;
format( hex_str, sizeof( hex_str ), "0x%sFF", color_str );
sscanf( hex_str, "x", color );
SendClientMessageToAll( color, "text" );