What Exactly Is Coal Cinder? A Detailed Explanation of the Definition of Coal Cinder

Coal cinder is a widely used potting medium for growing orchids. Some people say coal cinder works well for growing orchids, others say it is poor, and still others say coal cinder contains carcinogenic substances. After the news of the "coal cinder causes cancer" claim spread, orchid enthusiasts who had previously favored using coal cinderto grow orchidsbecame deeply worried and full of misgivings, with a strong tendency to "turn pale at the mention of coal cinder." Coal is divided into anthracite and bituminous coal. Coal cinder is the slag blocks and slag ash left after coal is burned. The coal cinder used by hand for growing orchids includes brick-kiln coal cinder, boiler coal cinder and honeycomb coal cinder. Whether in factories or in rural areas, coal cinder can be seen everywhere. Farmers in rural areas also use honeycomb coal cinder to improve the soil of vegetable gardens. For the coal cinder used in orchid cultivation, it is best to select gray-black slag blocks that have formed into lumps; powdery slag ash should not be used. (Zhang Bingfu)