Remove grains from corns,wash and soak them in water for 2-3hours.

If the grains are hard you may extend the time of soaking.

Now take half of the grains into a grinding jar,add about 1.5 cup water and grind to a smooth consistency.

Grind all grains.Strain through a strainer.Discard the residue.

Now leave the filtered part for 2 hours.

After 2 hours filter out the upper yellow layer.The white cornstarch layer can be see in the bottom.

Spread this white part in a flat thali /plate,and keep in sunlight for 4 hours.

After 4 hours,scratch the corn starch from plate.The inner layer is still wet.

Dry again in sunlight for 2 hours.Now the corn starch is dried.

Grind in a grinder to get a smooth flour.Corn flour /corn starch is ready.

Store in an air tight container and it can be used upto six months.