[en] The phase diagram for a gallium-indium alloy shows that the eutectic is formed at a temperature of 15.3 C and has a eutectic composition of 14.2 at. pct In (21.4 wt pct In). A eutectic melt is expected to solidify completely when the eutectic temperature is reached. This requires that no gravitational segregation occurs in the melt. A survey of the available literature on eutectic Ga-In revealed no prior experiments on the in situ visualization of solidification. The goal of this experimental work was to observe the isothermal solidification of a vertical layer of molten eutectic Ga-In in real-time using X-ray radioscopy