Swedish Tonic X Lyft Lab Collection 5. In the Dark Mint Tonic Syrup flavour we find the intense taste of cocoa together with a refreshing touch of peppermint. To enhance this dark sensation, the flavour is accompanied by a bitterness from Cinchona bark, sweetness from agave syrup and acidity from tart citrus fruits. One bottle is 200ml and is enough for about 10 drinks. Available in limited edition. The colour running down the bottle is for decorative purposes only.