Color Changing Cocktail

Chemists have long known that certain liquids will change color when the pH is altered. Here I use this technique to change a cocktail from blue to purple using butterfly pea flower tea.

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EQUIPMENT

1. Butterfly pea flower tea
2. Tea pot
3. Oil and vinegar cruet
4. Bottle for storage
5. Funnel
6. Cocktail set (includes Boston shaker, jigger, bar spoon, hawthorne strainer, fine mesh strainer, julep strainer, muddler, cocktail picks)
7. Coupe glasses
8. Angled measuring jigger 
   • Version using ml measurements
9. Citric acid

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Butterfly Pea Flower Tea

• 3g dried butterfly pea flowers
• 8oz (~250ml) hot water (just under boiling)

1. Brew tea for 5-7 minutes until a deep blue
2. Strain into a bottle and store in the fridge

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Color Changing Cocktail

• 2oz (60ml) of navy strength gin
• .75oz (22.5ml) of citric acid solution (1/2tsp citric acid and 3oz/90ml water)
  • Alternatively use fresh lemon juice
• .75oz (22.5ml) of simple syrup
• 1oz (30ml) of butterfly pea flower tea
• Small pieces of dry ice (optional)

1. Add gin, simple syrup, and tea to a shaker tin with ice
2. Shake for 15 seconds and double strain out ice
3. Add citric acid solution to inner chamber of cruet and cap
4. Add dry ice to outer cruet chamber
5. Pour in cocktail to outer chamber (do not cap with dry ice)
6. Pour blue cocktail inside coupe glass
7. Instruct guest to pour in citric acid solution
8. Watch the color change from blue to purple!