I have done a lot of B&W work. It is not too dangerous (the chemicals I mean) just be sure to dispose of them carefully. If you have a septic system, do not discharge to it as the metals are bad for groundwater. If you have a sewer connection, check with your town regarding discharge restrictions that may appy (not likely for the small volumes you will be discharging).
Enjoy!
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"All it takes to make a difference is the courage to stop proving 'I was right' in being unable to make a difference, to stop assigning cause for my inability to the circumstances outside myself, to be willing to have been that way, and to see that the fear of being a failure is a lot less important that the unique opportunity I have to make a difference."
-Werner Erhard
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