产于河南罗山。产地地处豫北丘陵山区，气候温湿，河道纵横，灵山鸭生长条件优越，无然饵料来源充足，所以产蛋个大、黄大、味纯。腌制时采用地方传统工艺。经选蛋、过照、验质、称重后。辅以当地产毛尖香茶、深井甘泉、糖、盐等多种原料熬制料水，浸泡缸底。根据季节气候变化调整料水温度。待5-6周后成熟、出缸。精选皮色好、无裂纹、弹性足者出口。
    
    松花蛋又称皮蛋、变蛋、灰包蛋（因为制做是有一层石灰包裹，很形象的名字！）等，口感鲜滑爽口，色香味均有独到之处。制作皮蛋的主要原料有生石灰，纯碱，食盐,红茶，植物灰（含有氧化钙，氢氧化钾）。皮蛋是我国一种传统的风味蛋制品，
    
    松花蛋不仅为国内广大消费者所喜爱，在国际市场上也享有盛名。经过特殊的加工方式后，松花蛋会变得黝黑光亮，上面还有白色的花纹，闻一闻则有一种特殊的香气扑鼻而来。经过历史的演变，松花蛋和咸鸭蛋已经成了我国最受欢迎的风味蛋，也逐渐形成了端午节吃两蛋的习俗。每每到了端午节，除了传统的粽子以外，咸鸭蛋和松花蛋也成了馈赠亲友的佳品！松花蛋，不但是美味佳肴，而且还有一定的药用价值。王士雄《随息居饮食谱》中说：“皮蛋，味辛、涩、甘、咸，能泻热、醒酒、去大肠火，治泻痢，能散能敛。”中医认为皮蛋性凉，可治眼疼、牙疼、高血压、耳鸣眩晕等疾病。松花蛋的传统制法，几乎都用到中药密陀僧，但皮蛋中的铅含量使人望而生畏。现在人们己研制出了无铅皮蛋的制法，爱吃皮蛋的人们，不必为铅中毒而担心了。
    
    成品松花蛋，蛋壳易剥不粘连，蛋白呈半透明的褐色凝固体，蛋白表面有松枝状花纹，蛋黄呈深绿色凝固状，有的具有溏心。切开后蛋块色彩斑斓。食之清凉爽口，香而不腻，味道鲜美。



    Xinyang Preserved Duck Eggs are produced in Luo Mountain, which is located in hill region in North Henan and owns moderate climate and intertlaced rivers. This advantageous climate and natural conditions provide plentiful natural forages for ducks and drive them lay big, yellow, taste-authentic eggs. Salted eggs are made depending on local traditional technique and combining with local Maojian tea, sweet spring water, sugar, salt and many other condiments, then being soaking at the cylinder bottom for 5 to 6 weeks, during this process altering water temperate according to changes of climate.
      
    Preserved duck eggs, also called Pidan, is not only well welcomed by Chinese customers but also enjoys a good reputation in the world. Finished preserved duck eggs has characteristics of easy to peel without conglutination; having transparent and brown solid egg white covered with pine-liked patterns, dark green solid yolk; colorful, cool, refreshing, delicious but not greasy.  With time passing by, preserved duck eggs has become a most well-welcomed flavor egg and is often used as gifts in the Dragon Boat Festival.  
      
    Preserved duck egg is not only a delicious snack, but also contains medical functions of curing sore eyes, teeth-ache, high blood pressure and other diseases. Nowadays, to our joy, people has developed its traditional technique, which always made eggs containing poisonous Pb, and created no-Pb preserved duck eggs.