We report on the serendipitous discovery of a carbon star near the centre of the low-metallicity globular cluster NGC 6426 .
We determined its membership and chemical properties using medium-resolution spectra .
The radial velocity of -159 km/s makes it a member of the cluster .
We used photometric data from the literature and the COMARCS stellar atmospheric models to derive its luminosity , effective temperature , surface gravity , metallicity , and approximate C , N , and O abundance ratios .
According to these properties , we suggest that this star is a genuine carbon rich low-metallicity AGB star .