Question

what is meaning of tarcoal​

Answer 1

Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal

Answer 2

It's coal tar, not tar coal.

BTW here's your answer....

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Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. It may be applied to the affected area to treat psoriasis and seborrheic dermatitis. It may be used in combination with ultraviolet light therapy.

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