An ink composition having, as essential components, at least a diacetylene tetraol compound represented by general formula (1) below and a glycol ether represented by general formula (2) below: (wherein R.sub.1 and R.sub.2 each independently represent C.sub.1-3 alkyl groups, --O-Et- represents oxyethylene, and k, l, m and n are each integers from 0 to 2); (wherein R represents a C.sub.8 alkyl group, and n is an integer from 4 to 8).