Selenium disulfide, also known as selenious disulfide, selenous disulfide, or selenium(IV) disulfide is a chemical compound. Its formula should be SeS2. It contains selenium in its +4 oxidation state. It also contains sulfide ions.
Selenium sulfide is a poorly known chemical compound. Sometimes it has more selenium, sometimes it has more sulfur. It is an orange solid.
Selenium sulfide can be made by heating selenium and sulfur.