Ink and ink, calligraphy and painting; the stone into gold, the inheritance of the sacred; the "Longchi 砚" born in the environment of Fujian, a happy and welcoming environment, the essence of nature, the craftsman's skill, ancestral craft Hand carved. From the selection of materials to the composition of materials, from the overall layout to the meticulous workmanship, finely crafted, time-honored; its texture is as firm as a rock, and it is soft and mellow into ink, known as the treasure of the room. It began in Tang, and it was in Song Dynasty. It has long been famous, and it is known as the "good quality". Nature's gift and the craftsman's carvings, Longchi is passed down from generation to generation, and the subtle and simple character of the downfall also affects the generations of musicians, one side of the land, one person; one side down, one side.

Longchi 砚 quality technical requirements (a) stone requirements. It is based on the shale-like silty sandstone meteorites from Shimenling to Lianhua Mountain in the north of Jiangle County, Fujian Province (four towns of Gulin Town, Shuinan Town, Gaotang Town and Guangming Township). Mud siltstone (60% to 65% sand, 35% to 40% rubber structure); SiO2 content 60% to 65%, Al2O3 content ≥18%; composed of sand and rubber structure, silty-like structure, Ingredients include feldspar, quartz and mica, and the particles are generally between 0.005 mm and 0.02 mm. (2) Key process flow. Quarrying → material selection → design layout → engraving → polishing → waxing → inspection → packaging. (3) Production process. 1. Quarrying: It is manually mined, and the stone is inserted into the deep hole of the cave or drilled. 2. Material selection: The ore is graded, and the material selection worker carefully predicts the stone pattern that cannot be seen on the surface, and preliminarily shapes and produces enamel. The selected stone should have no obvious scratches, cracks, etc. 3. Design layout: Based on the model, “Because of stone composition, in accordance with the material”, it focuses on the integration of literature, history, painting, calligraphy and stone. 4. Engraving: Pursue clear lines and exquisite embossing. The knife art is divided into deep knives, shallow knives, fine carvings, line carvings, and through carvings. 5. Grinding: Firstly, the hoe is coarsely ground with fine grinding oil stone, and then repeatedly ground with Longchixi fine sand and underground well water until there is no sand scratch on the part of the ink hall, and the hand feels smooth. 6. Waxing: Apply high-quality beeswax to the surface of the platform to achieve a uniform and moisturizing effect. (4) Quality characteristics. 1. Classification of varieties: (1) According to the shape: size 随, with shape 砚. (2) According to the quality level: first, second, third. 2. Sensory characteristics: (1) Appearance: The color is mainly black, some grayish black is slightly purple, and the surface is faintly visible with silver glitter; the texture is delicate, solid and heavy, warm and cool, and the tapping will make it crisp and sweet. sound. (2) Modeling and decoration: The art is based on the carving of dragons. (3) Engraving: mainly based on embossing, and techniques such as hollowing out; the carving is accurate and the lines are smooth; the objects are clear and the layers are distinct. (4) Character: Yingrun ink, oh, the water is out, the ink is like the wind, the ink is like oil (that is, the ink is thick, bright, bright, such as oil flooding), no water, no ice , immortal (grinding ink to prevent cockroaches), guardian. 3. Physical and chemical indicators: hardness (Shore) 30 to 60; bulk density 2.3 g/cm3 to 2.8 g/cm3; saturated water absorption ≤ 0.15%; ink volume ≥ 5 mm3 / min. 4. Safety requirements: Product safety indicators must meet the relevant regulations of the state for similar products.

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Producers within the scope of protection of Longchiyi GI products may submit an application to the Quality and Technical Supervision Bureau of Fujian Province for the use of “Special Marks for Geographical Indication Products”, which shall be examined by the Fujian Provincial Bureau of Quality and Technical Supervision and shall be examined by the General Administration of Quality Supervision, Inspection and Quarantine. Announcement approval. The legal inspection agency of Longchiyu is appointed by the Fujian Provincial Bureau of Quality and Technical Supervision.