Prosthetics

Foaming Gelatin Video

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Foaming Gelatin Recipe

Take 100 gram of the gelatine base.

Dissolve 1 teaspoon (5 ml) of Tartaric acid (food stores) in 1 teaspoon (5 ml) sorbitol in a little cup. You should always stay away from using water because it evaporates and makes the pieces less stable. Let the mixture stand for at least a minute.

Melt the gelatine in a big plastic cup (at least 5 dl so it won’t run over the edges later on).
In a microwave oven 100 g will melt in 30-60 seconds.
Once again be careful not to let it boil.

Stir down 1-6 teaspoons (5-30 ml) of white school glue (ex. Elmers in the US) with a plastic spatula or plastic spoon.
This type of glue is vinyl based and will help the bubbles from breaking down.
This will make the gelatine to be more stable and not collapse after cooling down.
The more glue you use the more stable it will get but it will also get harder and less elastic.
You will have to experiment to find a good mix for your purposes.

The reason why you should only use plastic tools is that cold metal tools inhibit the foaming process.

Now add the tartaric acid mix and stir quickly.

Now add 1 teaspoon (5 ml) Bicarbonate (food stores) and again stir quickly.

Now magic is happening! Let the mix rise for a while without stirring it. 30 seconds usually works fine..

The gelatine is foaming because the mix of tartaric acid and bicarbonate in combination with the heat produces carbondioxid (the same gas as you exhale).

The foam now needs to be refined for about a minute by slowly stirring before you use it in a mould or directly on skin.
If it cools of to much during the process you can reheat it in the microwave for a couple of seconds
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