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 * ﻿Methanol should never be digested because it is metabolized to form acid and formaldehyde.
 * These substances are toxic. For example formaldehyde can cause blindness. It is a substance used to preserve dead bodies.
 * [[image:http://scrapetv.com/News/News%20Pages/Entertainment/Images/blind-person-with-cane.JPG width="375" height="247"]] [|source][[image:http://motherjones.com/files/legacy/blue_marble_blog/morgue.jpg width="280" height="245"]][|source]
 * 15 milliliters of flormaldehyde can cause blindness and 30 milliliters will cause death.
 * Ethanol is used as alcohol in acloholic beverages. It is a manufactured by humans therefor it is not a natural occuring substance.
 *  [[image:http://www.allaboutaddiction.com/addiction/wp-content/uploads/alcohol.jpg width="265" height="237"]] [|source]
 * Isopropyl alcohol is rubbing alcohol. It can be used as a disinfectant, but is extremly dangerous if ingested.
 *  [[image:http://ourlifeingeneral.com/wp-content/uploads/2010/05/blog-rubbing-alcohol.jpg]] [|source] [[image:http://rpmedia.ask.com/ts?u=/wikipedia/commons/thumb/9/91/Phenol-2D-skeletal.png/75px-Phenol-2D-skeletal.png width="158" height="194"]][|source]
 * The phenolic group contains phenols. Phenols are mildly acidic.
 * Phenols can damage healthy tissues in humans.
 * Although, there are several milder forms of phenol such as 4-n-hexylresorcinol. This is used in mouthwash and lozengers.
 *  [[image:http://www.smartcoupondeals.com/wp-content/uploads/2011/04/listerine_mouthwash_coolmint_500.jpg width="191" height="202"]] [|source]
 * Ethers
 * Ethers are organic compounds related to alcohols. Ethers are bonded to two carbons instead of a carbon and a hydrocarbon.
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 200%; overflow: hidden;">Ethers are not soluble in water therefore they are not part of the hydroxyl group.
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