How to make Roma Plastilina modeling clay

Written by rachael muldrow | 13/05/2017
How to make Roma Plastilina modeling clay
Clay isn't just for kids; make a batch of your own professional grade sculpting clay. (coloured clays image by Joe Houghton from Fotolia.com)

Roma Plastilina is an oil-based modelling clay, similar to Plasticine, manufactured by the Spainsdh company, JOVI. Because it is easy to work oil-based clays into fine details, it is commonly used to help create moulds. However, most people would know oil-based clays because of their use in stop-animation -- also known as "claymation" -- films and advertisements. This is because the oil content allows the clay to remain permanently malleable. While the quality of shop-bought oil-based clays is reliable, they are sometimes cost-prohibitive. If you are up for experimentation, you can use a simple recipe to create your very own version of the fine Roma Plastilina clay found in art supply shops.

Things you need

  • 60 g (2 oz) Old Mine #4 ball clay

  • 18 g (2/3 oz) cheese wax (clear)

  • 12 g (0.4 oz) petroleum jelly

  • 7 g (1/4 oz) baby oil

  • Confectionery thermometer

  • Deep cooking pot, such as a turkey fryer

  • Ohaus triple beam gram scale

Put the wax in a deep pot and heat until the temperature on the thermometer reaches 121 degrees C (250 degrees F).

Add the petroleum jelly and baby oil.

Add the powdered clay slowly and reduce the temperature until the thermometer reads 82.2 degrees C (180 degrees F).

Turn heat to low and stir every couple of hours for 6 or more hours.

Remove clay from the heat at 32.2 degrees C (90 degrees F).

Knead clay until smooth and store in an airtight container.

Tips

  • This recipe will yield a batch of clay about the size of a golf ball; simply double the recipe to increase the yield.

Warnings

  • Do not try to make this clay in a crock pot.

Tips and Warnings

  • This recipe will yield a batch of clay about the size of a golf ball; simply double the recipe to increase the yield.
  • Do not try to make this clay in a crock pot.

Things you need

  • 60 g (2 oz) Old Mine #4 ball clay
  • 18 g (2/3 oz) cheese wax (clear)
  • 12 g (0.4 oz) petroleum jelly
  • 7 g (1/4 oz) baby oil
  • Confectionery thermometer
  • Deep cooking pot, such as a turkey fryer
  • Ohaus triple beam gram scale

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