Etching solution is probably more well known as solution containing Iron(III) Chloride. This Iron (III) Chloride is probably very bad for our environment (it is) or toxic plus very acidic. (See Wikipedia here for more info.)
If you have kids in your house and you like to etch your own PCBs, having too much of this toxic, etching solution is probably not a smart idea nor is it great for the environment everytime you wash it down the toilet (or sink).
Now, there’s a better, environmentally-friendly way
