What preservative can be used in papadum, papad

When I traveled to India years ago.I saw many vesions of papad varying according to regions.Often it’s the ighter colored ones I see in in street foods and eateries which is common in the southern India state of Tamil Nadu Karnataka and Kerala.
.Its a crispy round thin wafer that is fried and served as accompaniment in Indian meals …
It’s often prepared as dried biscuit like disc with varying diameters made from gram flour, lentils spices salt .Not really that difficult to formulate and many Indians had their own heirloom recipes for it.
It just fried in oil which allows it to expand bit

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