The crystals also form capillaries in the plaster. The crystals form a matrix-like structure in the plaster that gives it strength. These crystals are what make the plaster harden. When the calcium sulfate bonds with the water, it changes from hemihydrate to dihydrate.ĭuring the setting reaction, crystals are formed in the mixture of water and calcium sulfate. This is a chemical reaction where the water recombines with the calcium sulfate particles. This is because, when it is mixed with water a ‘setting reaction’ takes place. In its partially dehydrated state, it becomes usable as an ingredient in plaster. Once it has become partially dehydrated it is called calcium sulfate ‘hemihydrate’. During the heating process, the calcium sulfate loses some of its water content. The heating process is called ‘calcining’. Part of the processing involves grinding it up to a powder and heating it. The main ingredient in each of these types of plaster is calcium sulfate, which is similar to chalk.Ĭalcium sulfate is a mineral that is mined from the ground and processed. * The Repair Shop returns to BBC One, Wednesday 7 June, 8pm.There are a number of different types of plaster. It’s a reminder of where I came from, I will treasure it forever.” “It’s a beautiful image of my mother and it makes me start thinking about my past. It really brings back memories and transports me back to my childhood. He says: “This had an unexpected effect on me. On seeing the restored piece, Martin is completely overwhelmed, with tears in his eyes. It’s an important repair for ceramics expert Kirsten, aided by woodwork whizz Will Kirk, who turns his hand to sculpting a new oak base. Grandfather of four Martin adds: “The fascinating thing is it looks just like my daughter did at about the age of 18. Before she died in 1999, aged 77, she gave it to me, I think hoping I could fix it.” “Unfortunately it was in quite a bad state, with parts of it lost. It used to be pride of place in our living room when I was a child but eventually it ended up high on top of a wardrobe and fell off and smashed. “Miloš did the study early in his career. Martin adds: “My mother and father, who died in 2008, were part of an art scene, hanging out together and Miloš was in that group. We didn’t have a fridge, we didn’t have a TV, or a washing machine, but we had an apartment full of paintings and books.” As a child, my brother and I didn’t have a lot. It was there that she met Martin’s father, Josef Jochman, who was studying painting and graphic design. I’m sure it affected her a lot, but she was very brave and very gifted as well.”Īfter the war, his mother joined the art college to study ceramics. Martin says: “It was a terrifying time for her. When she was freed, Věra and many other prisoners trudged some 150km all the way to Prague in Czechoslovakia. She said that was quite emotional - after that she was free.” “When they were liberated, she told me how the Russian Commander arrived in an armoured vehicle and pointed a gun in the air and squeezed the trigger and it was a perfume gun. From a distance she saw the whole horizon on fire. I remember her talking about the allied carpet bombing of Dresden which was awful. “She ended the war in Waldheim, a women’s prison near Dresden, Germany. It wasn’t as horrendous as being in the extermination camps, so she survived the war in various prisons. “She was lucky to go into prison rather than a concentration camp because they actually were looked after a little bit better. My mother was tried at Nuremberg and sentenced to life in prison. “Her two friends were shot dead immediately. They took a train as far as the Swiss border but they were caught crossing the border. While there she planned with two male friends to escape to Switzerland. Martin explains: “Young people were sent to work in factories. She had a very colourful and interesting life, but also quite tragic.”īefore her studies, at the beginning of the Second World War when the Germans took over Czechoslovakia, Věra was sent to work in a munitions factory in Berlin. Martin says: “She was at art college in Zlín and he made the sculpture of my mother and gave it to her as a memory.
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