Posted by: glue | July 6, 2008

Charcoal Is

“Certain electrostatic properties develop in activated charcoal during production, which favor the binding of most poisons. When the gases, resins, proteins, fats, etc., in wood are burned out, the heat generated and the change in chemistry causes the development of a charge on the charcoal granule which attracts most poisonous substances. Nobody has fully understood the mechanism by which charcoal works, from either a physical or chemical standpoint. The capillary attraction is felt to be one mechanism, the electrostatic forces another, and perhaps other forces are also involved. Charred toast and other scorched food in the kitchen are not healthful, however. They are not charcoal. These represent charred protein, fats, carbohydrates, and minerals salts, the very parts burned away in charcoal, leaving only charred cellulose. The skeletal structure remaining in true charcoal is inert, whereas the remaining substances in charred food can react unhealthily with the body, and even act as cancer-producing agents. Activated charcoal is produced from the controlled burning of wood or bone, which is then subjected to the action of an oxidizing gas such as steam or air at elevated temperatures. This process enhances the adsorptive power of charcoal by developing an extensive network of fine pores in the material.”

Charcoal

Charcoal

  1. “Take a charcoal crayon and fill an entire paper up with black. You don’t need to draw anything yet. Just turn the white paper black. Don’t leave any blank, white spots.
  2. Find a good black-white photo. Try a portrait, even if you are a beginner. Put it in front of you and turn it upside down. If you do that, you do not have exact imagination of what you are drawing and your image will be unique. Aim for some basic highlights of the human face; you do not need to copy the image exactly.
  3. Take a piece of eraser and erase out the outline of the head. That’s right, you will be drawing with an eraser.
  4. Start with the eyes, since they are the whitest spots on your face. Do not place them all the way on top of the image, since that’s where you will draw hair. Also, consider eyeballs and the shines: Once you have the basic eye outline, take eraser and slightly make a rounded line inside of the eyeball. Now, your eyes really look realistic.”
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Responses

  1. […] – bookmarked by 4 members originally found by piotrpoznanski on July 17, 2008 Charcoal Is https://heuretics.wordpress.com/2008/07/06/charcoal-is/ – bookmarked by 3 members originally found […]


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