<prompt> Which of the following is a die hardenerCyanoacrylate.Potassium sulphate.Sodium chloride.Resin  <response>: Die hardeners arc materials used to reinforce the surface of a die so as to make it more resistant of abrasion and scratching.Die hardeners used with gypsum dies: Cyanoacrylate Silver plating Addition of die hardeners to gypsum 