For biochemical analysis vitreous in sent in -
10 mg fluoride in every 1 ml of vitreous humor is added for preservation in analysis of alcohol, cocaine, cyanide and CO. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 62.
Hydrochloric acid
Phenol
Formalin
Fluoride
Death and postmortem changes