Archived posting to the Leica Users Group, 2004/08/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]When you compare it to the drain cleaners and oven cleaners, it ain't all that bad. Mercury and organics solvents are more of a concern. Jeffery Smith New Orleans, LA -----Original Message----- From: lug-bounces+jls=runbox.com@leica-users.org [mailto:lug-bounces+jls=runbox.com@leica-users.org] On Behalf Of JCB Sent: Sunday, August 01, 2004 6:05 PM To: lug@leica-users.org Subject: [Leica] Re: Disposal of chemistry All down the drain. It is far more benign than many things you can buy, use, and pour down the drain. Home darkroom photo chemistry, color and B&W, would neither be able to be shipped nor sold over the counter if it had the potential of causing a problem. Even commercial labs get their chemistry via truck and spent chemistry goes down the drain. Because commercial labs run a huge amount of film and paper, their is a substantial amount of silver to be recovered. But other than the metallic silver, it all goes down the drain. The companies have reformulated their chemistry, over the past dozen or so years, to remove hazardous chemicals, such as formaldehyde and potassium ferricyanide. So unless you brew your own soup, containing copious amounts of bad stuff (formaldehyde, potassium ferricyanide, etc.) it all ends up benignly neutral when it arrives at your local sewage treatment plant. JB _______________________________________________ Leica Users Group. See http://leica-users.org/mailman/listinfo/lug for more information