Homebrew PCBs

Hi All,
    All chemicals and medicines are toxic to humans depending on dosage (XX.XX mg/kg etc.).
In the not to distant past I was a street Paramedic and in school during our pediatrics lecture we were presented with several cases of Iron overdose in infants or young children.
This usually occurred when the child's mother was taking prenatal vitamins prior to conceiving a second child.
(Actually they are often taken from thought of conception until after the resulting child is weaned from breast feeding.)
Prenatal vitamins have a high Iron content and although extremely beneficial to the mother, a child can easily overdose on them. 
But don't take my word for it, check this out: http://www.ansci.cornell.edu/plants/toxicagents/iron.html
Scroll about half way down to see what I'm talking about.

One of my most memorable quotes from one of my instructors was:
"Are you sure about that dosage? You want to cure your patient not kill them"

Have a good day,
    Kevin
  ----- Original Message ----- 
  From: JanRwl@... 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Tuesday, November 11, 2003 11:28 PM
  Subject: Re: [Homebrew_PCBs] How to handle Ferric Chloride safely and in environmental...


  In a message dated 11/11/2003 5:54:38 PM Central Standard Time, 
  suri_list@... writes:
  after i 
  have used it for etching a board how can i dispose it safely so that 
  it doesnt hurt the environment or anybody else.
  Harshit:  You should be able to use the same solution for MORE than one 
  board, depending on how DEEP you cover the board with it (6-7 mm. is usually 
  enough!), how warm the solution is, the "oz. thickness" of the copper you use, 
  whether single- or double-sided, etc. 

  I you use no more than a liter per month, you can probably flush small 
  portions of that down the toilet, assuming you have "public sewer system".  Sadly 
  for me, I have "private" septic-tanks, so this would ruin the bacterialogical 
  effect in that.  SO, I pour the stuff on WEEDS in the yard, where there is no 
  "good grass" to worry about.  It is NOT horribly nasty, except on the fingers!  
  However, I use no more than one or two liters of the stuff per year!  Do you 
  live near the sea?  You can pour DOZENS of liters of it in the sea, and it will 
  do NO harm, as it will be diluted in seconds, and will have NO "nasty" 
  effects.

  However, if you use 100 liters a week or more, I would not suggest this.  
  BUT, ferric chloride is NOT used for large-quantity production of PCB's, now, is 
  it???     Common sense!

  FeCl³ is simply IRON and CHLORINE.  Chlorine is a "nasty" gas, but in ionic 
  form, it combines readily with other ions to make harmless substances 
  (table-salt is 50% chlorine!).  Iron is not a poison!  Now, if it were Arsenic 
  Chloride, etc., that would be a different matter!  Think about it.


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