What is the ruling on saliva splattering onto clothes from a mouth that has the taste of blood? And what is the remedy for this situation?

Saliva expelled from the mouth, if not mixed with blood, is pure. However, if it is mixed with blood, it becomes impure, but a small amount is excused due to the difficulty of guarding against it. One must spit out blood when its taste is perceived in the mouth, and it is not permissible to swallow it.