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The family of Vincent Jackson, the retired three-time Pro Bowl N.F.L. wide receiver who was found dead in a Florida hotel room on Monday, donated his brain to researchers at Boston University to determine if he had chromic traumatic encephalopathy, or C.T.E., the degenerative brain disease linked to repeated head trauma.

Fellow workers pulled Swisher from the four-foot tank of liquid chromic acid and were performing CPR when first responders arrived.

The tank contained liquid chromic acid, Dayton fire officials said.

Young ticked through the toxic substances he is exposed to while manning the production line, such as hydrochloric, sulfuric and chromic acids, as well as tin, zinc and kinds of chromium used to plate metal objects.

A salt containing two parts of chromic acid to one of the other ingredients; as, potassfum bichromate; Ð called also dichromate.