  We search for "solar twins" in the Geneva-Copenhagen Survey (GCS) using high
resolution optical spectroscopy. We initially select Sun-like stars from the
GCS by absolute magnitude, b-y colour and metallicity close to the solar
values. Our aim is to find the stars which are spectroscopically very close to
the Sun using line depth ratios and the median equivalent widths and depths of
selected lines with a range of excitation potentials. We present the ten best
stars fulfilling combined photometric and spectroscopic criteria, of which six
are new twins. We use our full sample of Sun-like stars to examine the
calibration of the metallicity and temperature scale in the GCS. Our results
give rise to the conclusion that the GCS may be offset from the solar
temperature and metallicity for sun-like stars by 100K and 0.1dex,
respectively.
