Sour Wild Berry

What is it?

The sour version adds an acid layer on the outside of the shell rather than into the chew, so the sourness arrives first and fades as the sugar underneath takes over. That sequence is the entire design. Acid mixed through the sweet would read as a background tartness; kept on the surface it lands as a hit that then disappears, which is why sour sweets are sold on the reaction to the first few seconds. Berry flavours suit the treatment because they carry their own acidity anyway. Blackcurrant and raspberry are sharp before anything's added, so the coating amplifies something already there instead of imposing it.