Why is brown coal really black?

Brown coal, which is mined in the Far East, does not lie very deep underground, therefore it is mined by the open method, which is considered safer, more economical and fast. At first glance, a piece of coal raises the question "why is it brown if it is black?" But coal-mining specialists explained to me that earlier the quality of coal was determined by the trace of the trait left on the porcelain plate. Brown coal, as you understand, leaves a brown mark.
Why is brown coal really black? coal, brown, more, which, less, brown, quality, analyze, carefully, ash, substances, volatile, moisture, content, other, parameters, substances, units, volume, mass

Brown coal is less high in calories than stone and anthracite. We look at Wikipedia and find out that the caloric content, that is, the heat of combustion - the amount of heat released during the complete combustion of the mass or bulk unit of substance. Coal has other quality parameters - moisture and sulfur content, volatile matter and ash content. All this is carefully analyzed by the departments of technological quality control of coal and coal chemical laboratories.
Why is brown coal really black? coal, brown, more, which, less, brown, quality, analyze, carefully, ash, substances, volatile, moisture, content, other, parameters, substances, units, volume, mass

There is of course coal and a lighter color, but such coal is less common and the color of brown coal is more dependent on the location and composition.
More photos can be seen in the instagram "How it is done".

Related news

Why is brown coal actually black image, picture
Why is brown coal actually black 9


Why is brown coal actually black 10


Why is brown coal actually black 90


Why is brown coal actually black 45


Why is brown coal actually black 96


Why is brown coal actually black 97