We started our first introduction, which my group are doing slip casting. We chose an item we wanted to cast and bring it in. Step one was to take your object and place it on a board. If like my object it is round you have to add a little clay to keep it in place.
The next step is to find the middle of the light bulb. I did this by using a square ruler and drawing along the side with a wax pencil and rubbing it across the light bulb. You can see this above on the right.
Here I started to build up the clay to the middle line that I drew around the bulb. I had to make sure that the clay was two fingers thick all the way around, to make sure that the mould will be strong and won’t break due to being to thin. Once I had build the clay outwards and upwards, I began to smooth all the edges and the surface so they are nice and flat.
![14572061_978355645609780_1291837439_o](https://oliviacopeextilesblog.wordpress.com/wp-content/uploads/2016/10/14572061_978355645609780_1291837439_o.jpg?w=543&h=407)
You need to make a spout for when the mould is compete and I need to pour the slip into the mould to make my cast. The picture above shows my spout for my light bulb. You can put a spout anywhere, but I thought the perfect place was at the bottom.
Here I added boards around my piece. This is where I will pour the plaster into to create half of the mould. In the corner of the board, on the outside I added clay so that no plaster slips out when I poured it. It also keeps the board secure so that they don’t move.
Once my mould was finished I then had to prepare the plaster to pour. I needed 4 pints to fill my mould. I needed to fill my bucket up with 4 pint of water and then from the plaster ratio it says I need 3KG of plaster. Once I had the plaster I didn’t put it all in at once i shock little bits in at a time, so that the plaster is evenly spread at the bottom of the bucket. Then left it for 2 minutes. I then put my hand in the water and plaster and wiggled my hand underneath until I could make a figure of 8 on the surface and it stay for a second. This is the perfect time to pour the plaster. Whilst doing this I was removing all the bubbles that were on the surface of the plaster. I then carried my plaster over to my mould. Putting one of my hands over the boards, I poured the plaster through my fingers onto the light bulb. After the plaster was in the boards, using the back of my hand I pattered the plaster so any remaining bubbles came to the surface.
![14599879_978355918943086_2108986007_o.jpg](https://oliviacopeextilesblog.wordpress.com/wp-content/uploads/2016/10/14599879_978355918943086_2108986007_o.jpg?w=551&h=413)
I then gave the plaster around 20 minutes to set. At this point I then began to take the boards from around the mould. My next task was to take all the clay that was around the light bulb, but leaving the spout clay in. You need to leave the bulb in for the next part. I then cleaned around the bulb ready into the next step.