Dyestuff-containing microscopic capsule suspension for record materials, containing in microscopic capsules a lactone family dyestuff represented by the general formula (I): ##STR1## wherein a, b, c and d are each a carbon atom or either one or two atoms of said a, b, c and d are nitrogen atoms and the remaining atoms are carbon atoms, said a, b, c and d may have one or two substituent groups, adjacent a-b, b-c or c-d bond may form another ring, X and Y represent individually a benzene, naphthalene or aromatic heterocyclic ring which may include one or more substituent groups, and X and Y may be the same or different and may be coupled together to form a ring; and a metal ion sequestering agent in the capsules or a liquid medium in which the capsules are suspended.