What is the difference between empiricism and positivism?

Empiricist use scientific methods to test what is observable, if you cant see it cant be tested and doesn't exist - Cartesian mind/body dualism emerges.

Positivists use empirical methods but in addition to testing what is observable they use logic and reason to verify or falsify the real world out there.

Logical positivists argue that science is the only true form of knowledge and that moral and value judgments cant be varified or falsified.