Food Grade Limestone ( Poon Khao & Poon Dang )

lime-stone.jpg

Limestone, also known as calcium carbonate, CaCO3, and in one form, it is blackboard chalk!
In Thailand it's sold as a powder dissolved in water and is used to crisp-up vegetables, squid and in batters for frying to make the batter crunchy.

It is typically sold in small plastic pots like the one in the photograph, inside there is a bag of the limestone mixed with water. When cooking you only need the water which has the limestone already dissolved in it, leave the powder sediment in the jar. To make more liquid, add water to the jar and shake, then give the limestone plenty of time to dissolve. I find the best thing to do is to keep the water topped up after use, so that the limestone is always ready when I need it. The jar lasts a long time, it requires no special preservation.

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