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We revisit the possibility of distinguishing between Dirac and Majorananeutrinos via neutrino-electron elastic scattering in the presence of allpossible Lorentz-invariant interactions. Defining proper observables, certainregions of the parameter space can only be reached for Dirac neutrinos, butnever for Majorana neutrinos, thus providing an alternative method todifferentiate these two possibilities. We first derive analytically andnumerically the most general conditions that would allow to distinguish Diracfrom Majorana neutrinos, both in the relativistic and non-relativistic cases.Then, we apply these conditions to data on $\nu_\mu$-$e$ and $\bar{\nu}_e$-$e$scatterings, from the CHARM-II and TEXONO experiments, and find that they areconsistent with both types of neutrinos. Finally, we comment on futureprospects of this kind of tests.

Distinguishing between Dirac and Majorana neutrinos in the presence of general interactions