We have tried and taste tested many concentrate ranges from manufactures throughout the EU and have found a great range of flavours which were manufactured at home in the UK. We recommend to our diy mixers a general 10% up to 20% starting point for these flavours. Thiese flavours are best steeped for 7-10 days when mixed. Please note - These flavours DO NOT contain Diacetyl, Acetyl Propionyl or Acetion or any type of colourings. All flavours are Propylene Glycol based with Natural and Artificial Flavours. Enjoy!