The crystals are made using agar agar powder which is a natural gelatin made form seaweed.
Here is the recipe we used and below is a video of this Edible Crystal recipe in action from East Meets Kitchen.
2 cups water
2 tbsp plus 2 tsp agar agar (15 grams) (Thai Brand- telephone)
4 cups sugar
Bring water and agar to boil stirring often. Once agar is dissolved, stir in the sugar.
Using a candy thermometer simmer mixture over medium heat until mixture reaches 230 degrees Fahrenheit.
Pour into a greased dish.
Add the colours you wish to use.
To create our crystal effect we added our colours in ‘sections’ and gently swirled a few colours through each other using a kebab stick.
Let mixture set for at least 4 hours.
Cut or rip the set agar apart into crystal shaped shards.
Place on baking paper.
Let crystals sit for 3-4 days covered but not in a sealed container until a sugar crust develops on all sides.
If you want to create your own edible crystals and have any questions please email me [email protected] and I would be happy to offer advice.