re·ca·les·cence 
(rē′kə-lĕsəns)
(rē′kə-lĕsəns)n.
A sudden glowing in a cooling metal caused by liberation of the latent heat of transformation.
[From Latin recalēscēns, recalēscent-, present participle of recalēscere, to grow warm again : re-, re- + calēscere, to become warm, inchoative of calēre, to be warm; see kelə-1 in the Appendix of Indo-European roots.]
re′ca·lescent adj.