The purpose of the experiment is to use salt mass (properties of starch) to prepare plastic material used for creating three-dimensional pictures. This task develops creativity as well as manual skills. How to create remarkable pictures with 3D effect?
Salt mass containing water is liquid and plastic; however, in the course of baking its structure changes. Due to the effect of high temperature, the mass raises (swells), dries and hardens thus creating a three-dimensional effect. The main ingredient of flour is starch, i.e. a compound made up of a lot of sugar molecules linked together in long chains, which form a suspension in water. Due to the effect of high temperature, breaking of hydrogen bonds takes place between the starch chains, and water invades between its chains. As a result of the damage to the structure of starch its volume increases substantially. Then, the water contained in the mass formed evaporates, the distances between the individual chains decreases and consequently the mass hardens.
Starch syrup is otherwise called glucose-fructose syrup. It is a concentrated aqueous solution of simple sugars, glucose and fructose. It is formed from starch which is processed using enzymes or acids. It is a popular liquid sweetener used in the food industry.