Introduction: "Toxic" Ice Cream

About: My name is Britt Michelsen. I am a chemical engineer from Germany especially interested in computational fluid dynamics. To balance all the theoretical work, I like to make stuff in my free time

You might wonder why somebody would make something like this in the middle of summer. The reason is that my boyfriend and I are obsessed with Halloween and we start to prepare early every year. My favourite part is testing different recipes for the perfect Halloween dinner. Furthermore what better time to tryout a refreshing dessert than during the summer heat?

So whether you are just looking for a fun looking, easy to make sour ice cream or a dessert for your Halloween dinner, this recipe might be perfect for you.

Step 1: Stuff You Need


  • Sour rainbow candy, e.g. Airheads Xtremes Sour Candy (e.g. here)
  • 3 lemons (and two 2 tsp. of the zest, so use either pesticide-free ones or buy it extra)
  • 3 cups of Greek yoghurt
  • 1.5 cups of sugar
  • 1 pinch of salt
  • 1 tsp. of vanilla extract
  • green food colouring
  • optional (if you want your ice cream to glow under UV light): Vitamin B2 (Riboflavin)

I 3D printed the Barrel, but there obviously are other ways to make it. For example you can simply use a "Toxic Waste Hazardously Sour Candy Barrel" or even better your pottery skills. There are also readily available products, e.g. here, here or here.

If you would like to add labels you will also need some weather proof label sheets and some sealer.

Step 2: 3D Print the Barrel

You can skip this step, if you don't want to 3D print the barrel.

Should you decide to 3D print it, make sure to use food safe filament. Here is an interesting article about food safe 3D printing.

You can download and edit my design here. To open the file you will need Fusion 360. I have also uploaded a stl file of my finished design to this step.

As you can see I decided to not make it entirely hollow. This way it is easier to eat the ice cream.

Step 3: Hazardous Material Labels

There are a few different labels for hazardrous materials out there and each has a special purpose.

Here is a short summary to help you decide which label to use:

Label type
Provides information about...UsageExample
NFPA 704 ... hazards that occur during emergency responseOutside buildings, on doors, on tanks, visible to emergency responders during spill or fire
DOT Placards... hazards to transportation workers and emergency respondersTank cars, cargo tanks, portable tanks, bulk packages, vehicles or containers containing non ‐ bulk packages
GHS hazards pictograms... hazards to workers using chemicals under normal conditions of usePipes, drums, and containers of materials that are used in the workplace

You can of course pick whatever label you would like. I decided to go with the Department of Transportation (DOT) hazardous materials (Hazmat) Placards (also called "GHS transport pictograms").

In the Model Regulations of the UN Recommendations on the Transport of Dangerous Goods, hazardous substances are divided into nine classes (in addition to several subcategories) on the basis of the specific chemical characteristics producing the risk. Pick which ever class you would like and seem fit for your cup.

Step 4: Adding the Labels

Adding the labels is actually pretty straight forward. Simply print them out, cut them to shape and glue them to barrel. Afterwards use a sealer to make it water resistant.

I've added the label I used as well as one for radioactive materials to this step. You will need inkscape to open it.

Step 5: Making the Ice Cream

Since I have an ice cream maker, I used it. You can also freeze the mixture for about 3 hours, stir it, put it back in the freezer and repeat the process until you get a nice and smooth ice cream.

Start by pulling the rainbow candy apart and cut it into small pieces. We will add it to the ice cream later for some extra crunch and as decoration.

You will also need one tsp. grated lemon zest (the yellow stuff) from one lemon. As you can see in the picture you can simply grate it yourself.

Step 6: Making the Ice Cream

Making the ice cream is quite simple, all you have to do is to add the lemon juice from the three lemons, the two tsp. of the zest, the three cups of Greek yoghurt, the 1.5 cups of sugar, the pinch of salt and 1 tsp. of vanilla extract.

Step 7: Making It "Toxic"

I used to green food colouring and some vitamin B2 to archive the "toxic" look. Simply add a small amount of vitamin B2, stir for a short time, turn off the light and test how well it glows with an UV light.

Start you ice cream maker I noticed after a short time that for my taste it wasn't green enough, so I added a bit more food colouring.

Once the ice cream is done add your self-created sour sprinkles and after serving add a few more on the top.

Congratulation you are done.

Beat the Heat Challenge 2017

Runner Up in the
Beat the Heat Challenge 2017

Makerspace Contest 2017

Participated in the
Makerspace Contest 2017

Halloween Contest 2017

Participated in the
Halloween Contest 2017