What is the difference between an Electra steel back and an Electra blue plate? 

What is the difference between an Electra steel back and an Electra blue plate? 

Compared to the Electra Steel material, Electra Blue is thicker. This plate material offers increased printing stability and improved resistance to damage. This, in turn, effectively increases the plate life. Electra blue is double-sided and capable of etching four individual images per plate.