Jump to navigation Jump to search

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

WikiDoc Resources for Charcoal


Most recent articles on Charcoal

Most cited articles on Charcoal

Review articles on Charcoal

Articles on Charcoal in N Eng J Med, Lancet, BMJ


Powerpoint slides on Charcoal

Images of Charcoal

Photos of Charcoal

Podcasts & MP3s on Charcoal

Videos on Charcoal

Evidence Based Medicine

Cochrane Collaboration on Charcoal

Bandolier on Charcoal

TRIP on Charcoal

Clinical Trials

Ongoing Trials on Charcoal at Clinical

Trial results on Charcoal

Clinical Trials on Charcoal at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Charcoal

NICE Guidance on Charcoal


FDA on Charcoal

CDC on Charcoal


Books on Charcoal


Charcoal in the news

Be alerted to news on Charcoal

News trends on Charcoal


Blogs on Charcoal


Definitions of Charcoal

Patient Resources / Community

Patient resources on Charcoal

Discussion groups on Charcoal

Patient Handouts on Charcoal

Directions to Hospitals Treating Charcoal

Risk calculators and risk factors for Charcoal

Healthcare Provider Resources

Symptoms of Charcoal

Causes & Risk Factors for Charcoal

Diagnostic studies for Charcoal

Treatment of Charcoal

Continuing Medical Education (CME)

CME Programs on Charcoal


Charcoal en Espanol

Charcoal en Francais


Charcoal in the Marketplace

Patents on Charcoal

Experimental / Informatics

List of terms related to Charcoal


Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by heating wood, sugar, bone char, or others substances in the absence of oxygen (see char). The soft, brittle, lightweight, black, porous material resembles coal and is 85% to 98% carbon with the remainder consisting of volatile chemicals and ash.

The first part of the word is of obscure origin, but the first use of the term "coal" in English was as a reference to charcoal. In this compound term, the prefix "chare-" meant "turn," with the literal meaning being "to turn to coal." The independent use of "char," meaning to scorch, to reduce to carbon, is comparatively recent and must be a back-formation from the earlier charcoal. It may be a use of the word charren or churn, meaning to turn, i.e. wood changed or turned to coal, or it may be from the French charbon. A person who manufactured charcoal was formerly known as a collier (also as a wood collier). The word "collier" was also used for those who mined or dealt in coal, and for the ships that transported it.


Historically, production of wood charcoal in districts where there is an abundance of wood dates back to a very remote period, and generally consists of piling billets of wood on their ends so as to form a conical pile, openings being left at the bottom to admit air, with a central shaft to serve as a flue. The whole pile is covered with turf or moistened clay. The firing is begun at the bottom of the flue, and gradually spreads outwards and upwards. The success of the operation depends upon the rate of the combustion. Under average conditions, 100 parts of wood yield about 60 parts by volume, or 25 parts by weight, of charcoal; small scale production on the spot often yields only about 50%, large scale was efficient to about 90% even by the 17th century. The operation is so delicate that it was generally left to professional charcoal burners. These often worked in solitary groups in the woods and had a rather bad social reputation, especially traveling ones who often sold a sack (priced at about a day's wage) with lots of rubbish mixed in to farmers and townsfolk.

The massive production of charcoal (at its height employing hundreds of thousands, mainly in Alpine and neighbouring forests) was a major cause of deforestation, especially in Central Europe. In England, many woods were managed as coppices, which were cut and regrew cyclically, so that a steady supply of charcoal would be available (in principle) forever; complaints (as early as in Stuart England) about shortages may relate to the results of temporary over-exploitation or the impossibility of increasing production. The increasing scarcity of easily harvested wood was a major factor for the switch to the fossil fuel equivalents, mainly coal and brown coal for industrial use.

The modern process of carbonizing wood, either in small pieces or as sawdust in cast iron retorts, is extensively practiced where wood is scarce, and also for the recovery of valuable byproducts (wood spirit, pyroligneous acid, wood tar), which the process permits. The question of the temperature of the carbonization is important; according to J. Percy, wood becomes brown at 220 °C, a deep brown-black after some time at 280°, and an easily powdered mass at 310°.[citation needed] Charcoal made at 300° is brown, soft and friable, and readily inflames at 380°; made at higher temperatures it is hard and brittle, and does not fire until heated to about 700°.

In Finland and Scandinavia, the charcoal was considered the by-product of wood tar production. The best tar came from pine, thus pinewoods were cut down for tar pyrolysis. The residual charcoal was widely used as substitute for metallurgical coke on blast furnaces for smelting. Tar production led to rapid deforestation: it has been estimated all Finnish forests are younger than 300 years by their age. The end of tar production in the end of the 19th century meant also rapid re-forestation.

The charcoal briquette, first invented by Henry Ford, was first made using wood and sawdust scraps from his automotive assembly plant.[1]

Types of charcoal

Commercial charcoal is found in either lump, briquette or extruded forms:

  • Lump charcoal is made directly from hardwood material and usually produces far less ash than briquettes.
  • Extruded charcoal is made by extruding either raw ground wood or carbonized wood into logs without the use of a binder. The heat and pressure of the extruding process hold the charcoal together. If the extrusion is made from raw wood material, the extruded logs are then subsequently carbonized.

The characteristics of charcoal products (lump, briquette or extruded forms) vary widely from product to product. Thus it is a common misconception to stereotype any kind of charcoal, saying which burns hotter, etc.

Charcoal is sometimes used to power commercial road vehicles, usually buses - in countries where oil is scarce or completely unavailable. In the years immediately after the second world war, charcoal buses were in regular use in Japan and are still used today in North Korea.[3]


One of the most important historical applications of wood charcoal was as a constituent of gunpowder. It was also used in metallurgical operations as a reducing agent, but its application has been diminished by the introduction of coke, anthracite smalls, etc. A limited quantity is made up into the form of drawing crayons; but the greatest amount is used as a fuel, which burns hotter and cleaner than wood. Charcoal is often used by blacksmiths, for cooking, and for other industrial applications.

Cooking fuel

Charcoal briquettes are widely used for outdoor grilling and barbeques in backyards and on camping trips. Charcoal cannot be burned indoors without an adequate ventilation system, because poisonous carbon monoxide (CO) is a combustion product.[4]

Industrial fuel

Historically, charcoal was used in great quantities for smelting iron in bloomeries and later blast furnaces and finery forges. This was replaced for this by coke during the Industrial Revolution. For this purpose, charcoal in England was measured in dozens (or loads) consisting of 12 sacks or shems or seams, each of 8 bushels.

Automotive fuel

In times of scarce petroleum, automobiles and even buses have been converted to burn carbon monoxide released by burning charcoal. In occupied France during World War II, wood and wood charcoal production for such vehicles (called gazogènes) increased from pre-war figures of approximately fifty thousand tons a year to almost half a million tons in 1943.[5]


The porosity of activated charcoal accounts for its ability to readily adsorb gases and liquids; charcoal is often used to filter water or adsorb odors. Its pharmacological action depends on the same property; it adsorbs the gases of the stomach and intestines, and also liquids and solids (hence its use in the treatment of certain poisonings). Charcoal filters are used in some types of gas mask to remove poisonous gases from inhaled air. Wood charcoal also to some extent removes coloring material from solutions, but animal charcoal is generally more effective.

Animal charcoal or bone black is the carbonaceous residue obtained by the dry distillation of bones; it contains only about 10% carbon, the remainder being calcium and magnesium phosphates (80%) and other inorganic material originally present in the bones. It is generally manufactured from the residues obtained in the glue and gelatin industries. Its decolorizing power was applied in 1812 by Derosne to the clarification of the syrups obtained in sugar refining; but its use in this direction has now greatly diminished, owing to the introduction of more active and easily managed reagents. It is still used to some extent in laboratory practice. The decolorizing power is not permanent, becoming lost after using for some time; it may be revived, however, by washing and reheating. Normal recommendation is to leave the charcoal under the sun for few hours every month.


Charcoal is used in art for drawing, making rough sketches in painting, and is one of the possible media for making a parsemage. It must usually be preserved by the application of a fixative. Artists generally utilize charcoal in three forms:

  • Vine charcoal is created by burning sticks of wood (usually willow or linden/Tilia) into soft, medium, and hard consistencies. Bamboo charcoal is the principal tool in Japanese Sumi-e (炭絵 lit: charcoal drawing) art.
  • Compressed charcoal charcoal powder mixed with gum binder compressed into round or square sticks. The amount of binder determines the hardness of the stick. Compressed charcoal is used in charcoal pencils.
  • Powdered charcoal is often used to "tone" or cover large sections of a drawing surface. Drawing over the toned areas will darken it further, but the artist can also lighten (or completely erase) within the toned area to create lighter tones.


One additional use of charcoal rediscovered recently is in horticulture. Although American gardeners have been using charcoal for a short while, research on Terra preta soils in the Amazon has found the widespread use of biochar by pre-Columbian natives to turn otherwise unproductive soil into very rich soil. The technique may find modern application, both to improve soils and as a means of carbon sequestration.

Sources, references and external links


ca:Carbó vegetal cs:Dřevěné uhlí da:Trækul de:Holzkohle eo:Lignokarbo ko:숯 hr:Ugljen (crtački) id:Pensil arang it:Carbone vegetale he:פחם עץ nl:Houtskool sl:Oglje fi:Puuhiili sv:Träkol

Template:WH Template:WS Template:Jb1 Template:Jb2