Choose frosted kelp with high iodine content and a substance called mannitol, which will adhere to the surface of dried kelp as white powder. Therefore, it is best to choose dark brown dried kelp with frosted surface. Don't choose dried kelp that is half red and half yellow. Such kelp may be polluted, and its quality and nutritional value will become worse. In addition, dried kelp also has a strong seafood flavor. If there are other smells, the quality of kelp is also discounted.
3. Look at the high-quality kelp, the meat is tender, wide and long, the color is dark brown or brownish green, and there is less sand and impurities; On the contrary, the second quality kelp has thin meat, short and narrow leaves, yellow-green color and high content of sediment and impurities.
Look inside. When buying, we'd better open the kelp. Whole kelp is better; If there are small pieces of kelp mixed in, it means the quality is not good. If there is a hole or a large area of damage, it may be that moth or mildew occurred during storage.
5 smell the taste
The kelp seafood without bleaching and dyeing has a strong flavor, but the kelp seafood flavor after bleaching and dyeing is reduced.