Were prepared with the sleeve opening and closing wedges of pure magnesium and magnesium test system - phosphorus. Phosphorus as an element of a low boiling point (below the melting point of magnesium) had to be trapped in the prepared sample, that can not be evaporated. Naważono 10% by weight. red phosphorus powder and tightly locked up in the magnesium sleeve and then placed in a graphite crucible in the furnace - all held in a chamber filled with argon. Measurement of the temperature inside the oven was difficult to implement, since the thermocouple touches the outer wall of the crucible, so that the results of measuring the temperature indication treated. When a longer residence time of the sample in the furnace is still kept its shape at a temperature substantially above the melting point of pure magnesium was decided to puncture the sample graphite rod. Derived from a sample methodology used consisted of two parts, which were frayed appearance, they lacked firmness, crispness, and it was characterized by a distinctive odor, probably resulting from addition of phosphorus.