<prompt> True about formalinUsed as preservative in alcohol poisoningNever used as preservative for chemical analysisUsed as preservative only in digitalis poisoningUsed as preservative for any plant poisoning  <response>: Formalin is not used as preservative for chemical analysis because extraction of poison becomes difficult. PRESERVATIVES : 1. Saturated solution of NaCl - commonly used 2. Rectified spirit 95 alcohol - Best preservative 3. 10 Formalin - for histopathological examination 4. 50 Glycerol - for virology 5. NaF - For Co, Cyanide, Alcohol poisoning. Avoid salts in Avoid Rectified Spirit in 1. Corrosive except phenol 2. Aconite 1. Alcohol 2. Formalin 3. Phenol 