Firstly, consider buying the regular bakery cornstarch from your local supermarket. Let the cornstarch dry under sunlight for a few hours if possible. Now add the required amount of cornstarch into a bowl containing one cup of water. Stir the mixture until the starch is completely dissolved into the water. Remember to take your time and do not rush this important step.
To avoid the formation of lumps in the mixture, consider placing the water container on a stove for a short while. Set the oven temperature to medium and stir thoroughly to ensure there are no lumps and blocks. Use a wooden spoon to achieve the required thickness and texture. Research has shown that mixing water and starch on low heat improves the mixing process considerably.
Now place the mixing container into the microwave oven. Stir the mixture every 30 seconds until it comes to a boil and thickens. Do not use wood fire to heat the mixture as this can affect the concentration of the paste.
Allow the mixture to cool so you can handle without damaging your fingers and skin. For medium and light starch, consider adding some water to the mixture to achieve the required thickness and concentration.
Wash the fabric with clean water before placing it in the starch paste. Push the garment downwards to make sure the starch soaks through it uniformly. Repeat this step for all garments you want to starch using the mixture. Remember that the amount of starch that you put on fabric can significantly affect the stiffness after ironing.