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The long-range supercritical changes of dielectric constant, resembling onesobserved in the isotropic phase of rod-like liquid crystalline compounds, areevidenced on approaching liquid-solid discontinuous phase transition. The'supercriticality' can be an additional factor for supporting the uniquepro-health properties of linseed oil. It can also be significant for numeroustechnological applications. The report also reveals properties significant formelting/freezing discontinuous phase transition cognitive puzzle. Broadbanddielectric spectroscopy studies revealed long-range premelting (heating fromthe solid phase) and post-freezing (cooling from the liquid phase) effects withcritical-like parametrizations. They can be correlated with the 'grain model'for premelting and its development by the Lipovsky model. The evidence for thepost-freezing effect, with the critical-like portrayal, may indicate a specificgranular solidification associated with pretransitional fluctuations. Numeroushallmarks of liquid-liquid and solid-solid phase transitions have also beenfound. Notably, the melting temperature surrounding is related to the minimumand the freezing temperature to the maximum of dielectric loss factorD=tan(delta). Regarding dynamics, three primary relaxation processes have beenfound. Their changes in subsequent temperature intervals, related to theapparent activation enthalpy, follow critical-like patterns with the samesingular temperature. For relaxation times evolution, it leads to optimalparameterizations via the 'critical and activated' equation, recently proposed.

Broadband dielectric studies in linseed oil: Supercriticality and the New Insight into Melting/Freezing Discontinuous Transition