Wispa is a brand of chocolate bar manufactured by the British chocolate company Cadbury. First launched in 1981, the bar uses aerated chocolate and was seen as a competitor to Rowntree's Aero (now owned by Nestlé).[1] The Wispa brand was discontinued in 2003 and replaced by a different "Dairy Milk Bubbly", but the original Wispa returned as a limited product in 2007, helped by an internet campaign by enthusiasts, then permanently returned to shops in Britain and Ireland in 2008 due to popularity.[2]
Manufacture
The tiny bubbles within the chocolate form by aerating the molten chocolate with gas, typically carbon dioxide or nitrogen, while at a high pressure, which causes microscopic gas bubbles to form within the liquid. The liquid is then lowered to atmospheric pressure as it cools, causing the gas pockets to expand and become trapped in the chocolate. Air is not used to make the bubbles as this would oxidize the chocolate.
History
The bar was launched in 1981 as a trial version in North East England