*Q: What should I do with used pickle, etchant, or other chemicals? *

A: Many counties have household hazardous waste programs that are free and more environmentally friendly than pouring chemicals into the ground. Some chemicals/metals leech into groundwater or otherwise negatively affect the environment. Even copper (present in used pickle), which probably binds to soil long before reaching groundwater, will stay in the soil, preventing many plants from growing and can kill beneficial soil decomposers (worms, fungi, millipedes) that recycle soil nutrients.

Please check with your local county...there is probably a Department of Environmental Quality or similar department where you live.

For those of you in Tucson/Pima County, AZ, you can drop off hazardous waste for no charge---information is at:
http://www.pima.gov/deq/waste/householdhaz.html

Q: How do I build a ventilation system for my soldering or enameling area?
A: I made a pictoral tutorial which can be viewed here:
http://www.facebook.com/album.php?aid=2106402&id=1551731194&l=2442b37434
This shows a very simple, economical system that seems to be working well for me.