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More on liquid sulphur dioxide (SO₂)

• Sulphur dioxide (SO₂) can be purchased in pressurised bottles as a liquid.
  
  
• This form of SO₂ (sulphur dioxide) can be introduced into wine as a liquid, via a dosage meter.
  
  
• At atmospheric pressure, this liquid will immediately expand into the gaseous state and dissolve into juice, wine or water.
  
  
• The liquid form of SO₂ is suitable for larger wineries where it is introduced directly into tanks below the surface of the juice or wine.
  
  
• It is also directly introduced into empty, used oak barrels to inhibit microbial growth.
  
  Microorganisms readilly utilise ingrained wine residues found in used wine barrels as a nutrient source.
  
  This is often a source of wine spoilage.