Hand Casting

After casting  an ear, we then moved on to casting a hand, the method for this is the same as when we cast the ear, just on a slightly bigger scale. This hand cast then can also be used to create a bespoke prosthetic and can also be used in the film and television industry. Below are some pictures of the hand cast being made along with the method.

 

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Products/tools used

  • 2lt bottle
  • Vasaline
  • Water
  • Plastic sheet
  • Bucket
  • Alginate
  • Plaster

 

Method

  1. Cut the top of  a bottle
  2. Put the bottle on a chair (put it at that height that is comfortable for the model)
  3. Vaseline can be applied to the hand if it is dry to give some slip
  4. Fill the bottle with water, about an inch or so from the top and pour into a bucket. (the bucket should be on a plastic sheet on the floor)
  5. Mix the alginate up (see ear casting post) and pour it into the bottle. Pour a small amount into the bottom first, and then get the model to put their hand and continue to pour the rest in.
  6. Let the alginate set
  7. Once it has set, get the model to wriggle their hand out of the alginate while you pull on the bottle to also help release the hand
  8. Mix up the plaster
  9. Pour a small amount of plaster into the alginate mould, and coat the side of the cast. Then pour in the rest if the plaster, and over the top of the alginate to create a base for the positive of the hand cast.
  10. Once the plaster has set, cut down the side of the plastic bottle and remove it, leaving you with the alginate and the plaster inside. Gently remove the alginate, by pealing it off little by little until you are just left with the plaster hand.
  11. Once the plaster hand is left with no alginate on it, it can then be filed and smoothed down to remove any lumps or bumps.

 

Thanks for reading

Hannah xoxo

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Ear Casting

For our first full lesson back for creature design, we had to create a cast of an ear. The ear, once it is cast will then is used to create a prosthetic for our creatures we will be designing. Before we can make the positive of the ear out of plaster, we first had to use alginate to make a negative of the ear. To make the negative of the ear we had to plug the ear using cotton wool, the pour the alginate in to the ear using the top of a paper cup to hold the mould of the alginate ear.  Once the alginate is set you can then make a positive of the ear out of plaster. After the plaster is set the ear is then ready to be sculpted on to, so that a desired effect can be created. The process of this a cast can be used in the film and television industry, to make a bespoke prosthetic for an actor.  Below are some pictures of the ear cast being made and the method.

 

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Products/Tools needed

  • Cotton wool
  • Paper cups x2
  • Vaseline
  • Clingfilm
  • Bowl
  • Water
  • Alginate
  • Mixer
  • Modrock
  • Clay
  • Plaster

 

Method

Making the alginate negative

  1. Lie model down on one side a flat surface
  2. Put ear through cling film
  3. Vaseline the edges of the cling film down
  4. Put cotton wool in the ear, to block the alginate from going in the ear
  5. Make a wall around the ear with the large end of a paper cup
  6. Put tepped/room temperature water into a large bowl, (As alginate only has a short working time, around 3 minutes, you have to work fast when using it.)
  7. Pour the alginate into the bowl of water (this is probably a two man job,  so get a friend to pour the alginate while you mix) and mix together with an electric mixer, until it’s at a watery porridge consistency, this is when it is ready and you will have to be fast pouring it in to the ear.
  8. Pour alginate into ear, start by pouring behind the ear, until the ear is full submerged by the alginate. Make sure to put paper towels around the bottom of the cup to stop any leakage.
  9. Put a finger in the ear and move it around to remove any bubbles in the alginate
  10.  Leave the alginate for about 5 minutes, until the alginate goes solid.
  11. Remove the paper towel, the cup from the ear. ( to remove, pull the cup gently push it towards the back of the head, and then wiggle upwards to remove).

Making the plaster positive

  1. Cut another paper cup in half and place on top of the other cup.
  2. Use a couple of pieces of Modrock to hold the two cups together, and use clay to re-enforce the join of the cups and to stop the plaster from leaking out.
  3. Mix up plaster
  4. Pour the plaster into the new mould with the alginate ear in. Pour the plaster to the side of the ear  and move around to get the plaster into the ear, remove any air bubbles by gently shaking the mould, then continue to pour plaster into the mould, to give it a good base.
  5. Once the plaster is set, remove the clay and modrock from the outside of the cup and then cut away the remaining of the cups.  Once the cups have been removed, gently pull away the alginate, which will then reveal the plaster casting of an ear.

 

Thanks for reading

Hannah xoxo