Cẩn thận với mọi sản phẩm không cam đoan là da thật. Kiểm tra hạt da trên bề mặt sản phẩm, tức là những “nốt sần” và các lỗ nhỏ, để tìm các khuyết điểm và sự độc đáo chứng tỏ đó là da thật. Ấn vào da, quan sát các nếp nhăn. Ngửi đồ da, kiểm tra mùi mốc tự nhiên thay vì mùi như nhựa hoặc hóa chất. Thử bằng phương pháp đốt, nhưng bạn nên biết rằng cách này có thể làm hỏng một phần món đồ. Chú ý đến đường rìa của tấm da, vì da thật sẽ có rìa thô ráp, còn da giả có rìa mịn và thẳng tắp. Gập món đồ da, quan sát sự thay đổi nhẹ về màu sắc nếu là da thật. Thử bằng cách nhỏ một giọt nước lên món đồ, vì da thật có tính hút ẩm. Biết rằng hàng da thật rất hiếm khi có giá rẻ. Không xét về màu sắc.

Given the above summary, write a detailed text in English for it.
If it is labeled as ‘manmade material,’ it is definitely synthetic leather. But if it doesn't say anything at all, chances are good the manufacturer wants to conceal the fact that it isn't real leather. Of course, used goods may have lost their tags. But most manufacturers are proud of the fact that they use real leather, and will note it as following:  Real leather Genuine leather Top/Full grain leather Made with animal products Imperfections, in leather, are actually a good thing. Remember, real leather is made from animal skin, and thus each piece is as random and unique as the animal it came from. Very regular, even, and similar grains often indicate a machine-made piece.  Real leather might have scratches, creases, and wrinkles -- this is a good thing! Note that, as manufacturers get more skilled, their designs are better mimicking real leather. This makes buying online, where you only have a picture, very difficult to do. Real leather will wrinkle under the tough, just like real skin. Synthetic materials usually just depress down under your finger, retaining rigidity and shape. If you're completely unsure of the smell you're looking for, head into a store that you know sells genuine leather and test out a few bags and shoes. Ask if they have any synthetic pieces and smell those as well. Once you know what you're looking for, the smell differences will be unmistakable. Remember, leather is just worked animal skin. Faux leather is made of plastic. It seems obvious, but real leather will smell like skin and fake will smell like plastic. While there are few circumstances where burning a good is preferable to leaving it alone, this experiment works if you have a small, hard-to-see area that you can test, like the underside of a couch. Hold a flame up to the area for 5-10 seconds to test it out:  Real leather will only char slightly, and smell a bit like burnt hair. Faux leather will actually catch flame, and smells like burning plastic. Machine made leather looks machine cut. Real leather is made of many...