Yingshi, a national geographical indication protection product, also known as Yingdeshi, is produced in Yingde City, Guangdong Province. Since the Qing Dynasty, Yingshi has been listed as one of the four famous stone gardens in the country (Bingshi, Taihu Stone, Lingbi Stone, Yellow Wax).

Yingshi quality technical requirements (1) product category. It is divided into Yin Ying and Yang Ying Shi. (2) Technical specifications. 1. Collection method: It is required to keep the original appearance of the stone when collecting, without any artificial carving, and there must be no damage. Small pieces can be collected by hand; the components and the middle of the device can be collected with a stylus and cut with a steel saw; the collection of the large device can be operated with modern tools. 2. Cleaning: Infrared stone is first washed with industrial nitric acid with a pH of 2.0 to reveal the natural color; Yangying stone is cleaned with water to maintain the natural color and posture of the stone patina. (3) Quality characteristics. 1. Appearance features: (1) Color: The color is black, gray black, gray gray, light green, red, white, yellow, etc. Pure black is the best, red and color are rare, the stone tendons are evenly distributed, and the color is smooth. Top grade. (2) Features: thin, wrinkled, leaking, and transparent. The thin finger refers to the body state; the wrinkle refers to the stone surface texture is deep, the corners are prominent; the leaky finger flow marks are moderately ordered; the through holes are connected to each other. The surface of the ash stone is round and lustrous, and the porous eye focuses on “leakage and penetration”. The surface of the yang stone is more angular, wrinkled, less perforated, and focuses on "skinny, wrinkled". (3) Quality of Yingshi: It is divided into treasures, fine products and qualified products. It has four characteristics of “skinny, wrinkled, leaking and transparent”, and it is regarded as a treasure in all sides; it has four characteristics of “skinny, wrinkled, leaking and transparent”, and the color is pure black, pure white, pure yellow or colored. It is a qualified product with one of the four characteristics of “skinny, wrinkled, leaky and transparent”. 2. Intrinsic quality requirements: (1) Physical property index: Classification project failure load (KN) Compressive strength (Mpa) Yangshi 97.5～165.036.6～57.2 Yinshi 105.0～183.033.1～59.5 (2) Chemical composition: Classification item CaCo3MgOSiO2Al2O3Fe2O3 Yangshi 85.0~95.00.50~1.05.0~8.00.40~0.600.80~1.25 Yinshi 86.0`~96.01.50~2.204.50~6.501.00~1.500.50~0.80

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Producers within the scope of protection of Yingshi Geographical Indication Products may submit an application to the Quality and Technical Supervision Bureau of Yingde City, Guangdong Province for the use of “Special Marks for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.