Adulteration of food that we buy in India is an unfortunate fact of life.
I was shocked to read recently that over 75 percent of all milk sold in India has a quality problem. Here is a news item – https://mumbaimirror.indiatimes.com/mumbai/other/78-of-the-milk-we-consume-is-inferior/articleshow/66700933.cms
This extends to many other things like grain, spices, pulses, flour, and more.
The FSSAI has published a booklet of simple tests, that can be done at home, to detect adulteration in food.
You can check out the booklet here – https://foodsmart.fssai.gov.in/DART.pdf