I purchased the 10ml bottle to give this flavour a try as its also sold in 100ml and 500ml bottles so must be popular.
Flavour mix strength is recommended between 5%-20% so I made up four mixes, 5%, 10%, 15% and 20% and let them steep for 3 weeks.
Taste is a personal thing I know but the 10% was perfect for me as at 5% the flavour was barely in the background and 15% and above too overpowering.
Let all the ingredients blend for 2-3 weeks after mixing and you will be rewarded with a smooth caramel/tobacco that's good on its own or blended with other tobacco flavours.