Yongle blue-and-white is mainly made of "Ma Su Liqing" cobalt, which is naturally dizzy when fired. Due to the low manganese content and high iron content, the red-purple tone in the color is reduced, and a rich blue-green color can be burned at a proper temperature, like sapphire blue, elegant and dignified, bright and distinct. However, due to the high iron content of blue and white flowers, the burnt parts of blue and white flowers often leave black spots. A common cobalt-iron-bonded crystal spot in texture, which condenses into black tin light in a thick place, and the concave surface goes deep into the fetal bone, and it is uneven when touched by hand. There is also a combination of imported materials and domestic materials, such as painting clouds and water with light-colored domestic materials and painting Youlong with heavy-colored imported materials, which makes the colors contrast sharply and highlights the theme. Among the handed down products, there are also porcelain with elegant and beautiful blue and white color and no iron rust spots and black spots. In fact, the blue and white materials used are still difficult to determine. It is estimated that cobalt materials with high purity in China are all washed or imported domestic mixtures. Shanghai quaint Culture Communication Co., Ltd. is located in Shanghai Kaixuan Road 1020 along the street 1500 square exhibition hall. It is a large-scale art collection appraisal and exhibition sales platform. The company employs national-level experts in cultural relics appraisal as technical consultants, and arranges experts with authoritative qualifications and practical experience to stay in the field for appraisal all the year round. At the same time, we cooperate with well-known domestic museums, museums and appraisal and testing institutions to conduct all-round authoritative appraisal of customers' collections. Our company's operation mode: the operation mode of combining auction with economy-full refund for unsold collections! ! ! Operation before the auction: Many powerful collectors from Hongkong and Chinese mainland are invited to come here from time to time to buy our auction. Auction operation: auction site bidding and post-auction operation: if the auction is unsuccessful, we will also contact the buyer to discuss with you and reduce the reserve price. The advantage of our company is that it has an art exhibition center. Nowadays, collection is considered as the most popular investment method in Chinese mainland after stocks and real estate. Whether it's a wealthy businessman or a rising bucket, ordinary people want a piece of it. Therefore, the collection market is becoming more and more popular, and the ranks of collectors are also growing. According to incomplete statistics, there are nearly 10,000 collectible associations and collectible markets in China, with 70 million collectors. China has entered the era of national collection! We are convinced that with the development of China society and the improvement of market rules and laws and regulations, we look forward to cooperating with all relevant people, collectors, connoisseurs and investors to promote and popularize the collection and appreciation of China's artworks and make contributions to the construction of China's market economy. Looking forward to the future, the company will rely on the advantages of "talent advantage, proficient business, extensive information and strong social foundation" to maintain strong enterprise vitality, accumulate valuable fresh experience and strive to promote the development process. With the company's strong economic strength and keen insight, we will work hard and strengthen our confidence to build a high-quality, standardized, efficient and honest enterprise. Company: China Guya Culture Communication Co., Ltd. Publisher: Chen Bo (manager)