Brown glass jar, with plastic screw cap, sealed with heat sealed viscose,and paper label. Containing 5 grams of diamorphine hydrochloride (heroin).Diamorphine hydrochloride (heroin) is similar in action to morphine; it is a much more potent than morphine but it has a shorter duration of action. It is used to treat severe pain in cases of advanced cancer when morphine in safe doses has proved inadequate. The jar dates from between .