Gather the necessary materials- To manufacture the crystal of alum. we need alum, two glass jars, a spoon, hot water, a long wood pencil, some clear string, plastic wrap, food colouring, and safety glasses for our eyes.
Make a saturated alum solution- To manufacture the crystal, prepare a solution of hot and alum. As alum dissolves in hot water easily. Then, add food colour to a solution with continuous stirring.
Transfer the saturated solution into the clean jar-The solution is then transferred to the clean jar.
Cover the lid of the jar- Cover the clean jar with plastic wrap to prevent the entry of dust particles. Then, leave the jar disturbed for hours.
Pour the solution only into a clean jar- After 24 hours crystals are formed at the bottom of the jar. Then, transfer the solution to the new jar and choose the crystals of alum.
Thus, By following this procedure we can make alum at home.