Chapter 667: Su Ping Goes North

u Jinchang looked up, a look of hatred etched into his tear-stained face. "My son is in the prison, Your Highness promised me absolute safety for him!""There's never absolute safety in this world. It...e, before that, saltpeter was mostly used by civilians to make gunpowder, fireworks, and alchemists' potions. Although its uses were quite widespread, the consumption volume was actually not large, so...