Edited sentence: (Lead is being removed from such applications owing to its toxicity and consequent difficulty in recycling devices and components that include lead.In contrast, when lead-tin mixtures are used to solder seams in automobile bodies a pasty state enables a shape to be formed with a wooden paddle or tool, so a 70-30 lead to tin ratio was used.In the phase diagram, the extreme left and right concentrations, and the dip in the center, the material will be solid and become liquid has heat is added, where at other proportions the material will enter a mushy or pasty phase.Lead-tin mixtures formulated at that point (close to a 50-50 mixture) are useful when soldering electronic components, particularly if done manually, since the solid phase is quickly entered as the solder cools.The mixture at dip point of the diagram is called a eutectic alloy