Methanol is a toxic form of alcohol that is used industrially as a solvent, pesticide or an alternative source of fuel.
The teenagers died at the Enyobeni tavern in East London's Scenery Park township in the early hours of June 26, shocking the country and resulting in several investigations by the police and liquor license authorities.
South Africa's police will be guided by the final results of the toxicology analysis to determine whether anyone will face criminal charges for the 21 deaths, national police minister Bheki Cele has said.
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