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Schematic phase diagram of binary chemical mixture. Urea (A), at the far left of the diagram has melting temperature (TA) of 133 °C. Choline chloride (B), at the far right of the diagram has a melting temperature (TB) of 302 °C. The liquidus lines slope downwards the melting points of the pure components and meet at a point known as the eutectic point (indicated by the black dot). Deep eutectic liquids (TE) have melting points far below any of the starting materials
