Slush Puppie's blue-and-red dog logo has been on UK cinema counters since the 1980s, but the frozen-drink format it belongs to is older, and its American rival got there almost entirely by accident.
Where the format actually started
- Snow cones — shaved ice desserts have existed for centuries, but the modern snow cone machine was patented in the US in 1919 by Samuel Bert in Dallas, Texas, making cheap shaved ice a fairground and street-vendor staple.
- ICEE — in 1958, Omar Knedlik, who ran a soda fountain in Coffeyville, Kansas, found his fridge broken and his sodas frozen solid; customers preferred the half-frozen slush that resulted, and he patented a machine to recreate it on purpose.
- Slush Puppie — launched in the US in 1970 by Will Radcliff in Cincinnati, Ohio, as a competing brand built on the same churned-ice principle, and later exported widely to UK cinemas, seaside arcades and market stalls from the 1980s onward.
How the machine actually keeps it slushy
A slush machine holds a mix of water, sugar and flavoured syrup in a chilled barrel, typically around -4°C to -6°C — cold enough to freeze the mixture, but the machine's internal blades or scrapers constantly churn it. That continuous agitation breaks up ice crystals as they form, so instead of freezing into a solid block the mixture stays as fine, slushy ice suspended in syrup. Turn the machine off for too long and you'll find out the hard way what it looks like when it does freeze solid.
Slush vs snow cone
The two often get lumped together, but they're made differently. A snow cone starts with ice that's already shaved or crushed, with syrup poured over the top afterwards — the flavour sits mostly on the surface. A slush machine blends the syrup into the ice as it churns, so the flavour runs through the whole thing rather than pooling at the bottom of the cup.
Frequently asked questions
Who invented Slush Puppie?
The Slush Puppie brand was created in the US in 1970 by Will Radcliff in Cincinnati, Ohio, building on the earlier frozen-drink format popularised by ICEE.
How does a slush machine stop the drink from freezing solid?
Slush machines constantly scrape and churn a mix of water, sugar and flavoured syrup inside a chilled barrel, usually held around -4°C to -6°C. Continuous agitation stops large ice crystals forming, keeping the mixture at a spoonable, drinkable slush rather than a solid block.
What's the difference between a slush and a snow cone?
A snow cone is shaved or crushed ice with syrup poured over the top, so the ice and syrup stay separate; a slush machine blends syrup directly into the ice mixture as it churns, so the flavour is distributed all the way through.