The method shown is how to start with an original detailed model in plasticine.
There is a video that shows this process in the last step.
There are other videos in this series, that show casting in plaster from plasticine, using the mouldings to recreate the model in durable in papier mache, costume making and more.
View Micro Mr Punch videos on YouTube:
Look at Micro Mr Punch phtots on flickr
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Step 1: Start With a Head Modelled in Plasticine
This instructable assumes you have made your original model...
Step 2: Find a Plane to Form the Mould Halves
Once you have decided on where the split will be, you cut into the model to a depth of about 1.5 cm all around. A scalpel will cut plasticine easy. You can also chill the model, to stop it getting distorted, and heat the scalpel to help it cut easier...
Step 3: Create a Cardboard Dividing Plane
Step 4: Build Up the Mould Containers
Rest the cardboard inserted into the model on one of these, and seal the gaps with gaffer (duct) tape. Turn over and secure the otehr tube on the otehr side of the cardboard plane...
Step 5: Inside the Finished Mould
Step 6: Pour the Plaster Into the First Half of the Mould
Allow to dry - overnight is best.
When one half is dry, mix more plaster, fill in the other side, repeating the bubble deterring actions...
Step 7: Remove the Cardboard Round the Mould
Step 8: Remove the Plasticine
Step 9: Clean Up the Mould
Step 10: The Finished Mould
These can then be used to make papier mache casts from, with all the detail of your wonderful original.