Note: Chlorhexidine may cause staining of the tooth, tooth filling, and dentures or other mouth appliances. Tetracycline use during tooth development phases (from the last half of pregnancy through eight years of age) may cause permanent discoloration (yellow, gray, brown) of teeth.
What is Coal made of? Coal is made from trees or plants that decayed on the ground for millions of years. The remains of various plants and trees then mixed with the other components of the ground and eventually going through several natural processes making them more like solid rocks.
Coal tar is a by-product generated while processing coking coal into low ash metallurgical coke in a recovery-type coke oven plant. Coal tar accounts for around 3.5-4% of coke produced.Coal tar pitch is a complex chemical with 22 chemical and physical properties obtained through coal tar distillation, which involves the conversion of coal tar into a variety of intermediate chemical products.oal tar is a by-product generated while processing coking coal into low ash metallurgical coke in a recovery-type coke oven plant. Coal tar accounts for around 3.5-4% of coke produced.