There is a much easier and reliable way to test it -> https://eatrightindia.gov.in/dart/#:~:text=Test%2014%20%3A%2...
The test is: when you add the powdered turmeric to water, natural turmeric will give the water a "light" yellow color, while adulterated turmeric will give it a "strong" yellow color.
This is not a test that I'd characterize as "easy" or "reliable".