This is the lyric poem of lime written by Yu Qian, a patriotic general in Ming Dynasty ... This poem contains the source and origin of lime.

A thousand hammers cut deep mountains-physical changes. If the fire burns accidentally-CaCO3 = (high temperature) = CaO+CO2↑ = smashed into pieces, you are not afraid-Cao+H2O = Ca (OH) 2-Ca (OH) 2+CO2 = CaCO3+H2O.