use v5.10;
use Data::Dumper;
use Devel::Peek;

print unpack "C*",'Köln';
Dump 'Köln';

75 246 108 110
#note that ö is represented with a single byte extended #ascii decimal 246

SV = PV(0x2813394) at 0x20cef84
  REFCNT = 1
  FLAGS = (PADTMP,POK,READONLY,pPOK)
  PV = 0x20d4724 "K\366ln"\0
  CUR = 4
  LEN = 8