Blood agents are absorbed into the body through the action of breathing. Once in the body and blood stream, they prevent blood from passing or transferring oxygen to tissues and organs.

• •Type and ID Information
• Hydrogen cyanide (AC) 
• Gas form UN1051, ERG 117 
• Liquid form UN1613, ERG#154 or UN3294, ERG#131
• Cyanogen chloride (CK) – UN1589, ERG# 125
• Dissemination—Liquid or gas
• Availability—Commercially available; used in various manufacturing processes, such as electroplating, metallurgy, metal cleaning, and photography
• Volatility—Nonpersistent; it only poses immediate, short-duration hazards (e.g., hours)
• Vapor density—Range from slightly lighter than air to significantly heavier than air
• Hydrogen cyanide = 0.94
• Cyanogen Chloride = 2.16
• Odor—Bitter almonds (peach pits)
• Routes of entry—Inhalation or ingestion
• General signs and/or symptoms—Gasping for air, frothing or vomiting, losing consciousness, and dying; onset of symptoms occurs very rapidly, within seconds