The product's official title of "Rowntree's Chocolate Crisp" was renamed "Kit Kat Chocolate Crisp" in 1937, the same year that 'Kit Kat' began to incorporate "Break" into its recognisable advertising strategy.[2] The colour scheme and first flavour variation to the brand came in 1942, owing to World War II, when food shortages prompted an alteration in the recipe. The flavour of "Kit Kat" was changed to "dark"; the packaging abandoned its "Chocolate Crisp" title, and was adorned in blue.[5] After the war the title was altered to "Kit Kat" and resumed its original milk recipe and red packaging.
4-finger Kit Kat
Following on from its success in the United Kingdom, in the 1940s "Kit Kat" was exported to Canada, South Africa, Australia and New Zealand. During the same decade Donald Gilles, the executive at JWT Orland, created the iconic advertising line "Have a Break, Have a Kit Kat". The brand further expanded in the 1970s when Rowntree created a new distribution factory in Germany to meet European demand, and established agreements to distribute