Abstract: Both remorse and blame are clearly negative moral emotions. But while few have considered remorse to be an unhelpfully negative moral sentiment, the idea that blame is unhelpful and pointlessly negative is frequently expressed, with the implication that moral life would be better without it. I think this is wholly mistaken. As an antidote, I will try to present a more positive, because transformative, style of blame: Communicative Blame. I will propose it as an essential moral emotion, and as the second-personal counterpart to remorse. This pair of mirror emotions structures our most basic moral 'reactive attitudes'. I shall argue that remorse and blame together work to bring the different parties’ moral understanding into alignment; and that they also work to align their shared moral reasons. Together they continuously (re-)generate our shared moral life.