You may be hearing in news that plenty of synthetic or adulterated milk is out there and may be suspecting the milk you have is pure or not.
You can check purity of milk to some extent at your home without visiting any Lab. This simple test will help you to know whether milk is real of synthetic.
Prepare curd (Dahi) from the milk. For this, take milk, warm it and add a little amount of previously prepared Dahi (you can use Dahi available in the market, but its better use the loose one instead of packed). Keep it in warm place and observe after 24 Hours. If it is milk, smooth curd will form with a pleasant smell and sightly acidic and sweet test. But, if it is Synthetic milk, curd will not form. Even if it forms, it will be of very bad texture, frothy, smelling bad or like elastic.
This test will only work to know milk is real or synthetic, if milk is adulterated, like sugar addition, water addition, starch addition, vegetable oil addition etc. then this test will not work.
In the case of checking adulteration, if curd forms, take it and prepare Ghee out of it (in traditional way) and then observe it. If you have idea how good Ghee smells and tastes, you would know for sure presence of any dulterant,
Try this test with the milk you get from your Shop Apni. http://www.shopapni.in