Weird thing I don't understand - changing text on signs

Hi,

I'm trying to change the colour of text on a sign after it's written. My code:

Code:

    @EventHandler
    public void onSignChange(SignChangeEvent e){
        if (e.getPlayer().hasPermission("zs.sign.create")){
            String[] txt = e.getLines();
            if (txt[3] !=null){
                if (txt[3].equals("[Buy]")){                 
                    if (txt[0] !=null){                     
                            char[] chars = txt[0].toCharArray();                             
                            int nr = chars[1];
                            for (int i = 0; i < chars.length; i++){
                                Bukkit.broadcastMessage(i + " = " + chars[i]);
                            }
                            e.setLine(0, ChatColor.GRAY + "[" + ChatColor.GOLD + nr + ChatColor.GRAY + "]");
                            e.setLine(3, ChatColor.GRAY + "[" + ChatColor.GOLD + "Buy" + ChatColor.GRAY + "]");
                            e.getBlock().getState().update();
                    }
                }
            }
        }
    }

So yeah, most of this works. The only problem: on the first line.. it puts [49] (with colours), while it should be [1] (if 1 was entered). I tried printing out the values of chars[], but it simply gives me 0 = [, 1 = 1 and 2 = ].. so why does it put '[49]' on the sign, then? :l

Anyone knows why this is happening?

 

you convert a char to int. 1 is the 49th ASCII character