selenium toner is bad stuff.
dispose of it the "right way" even though someone
on the other side of the world may suggest its harmless.
stranger things have happened here on apug with scientists nonetheless
not saying maris is like this person, he has a respect for photography
annd its chems...
but several years back a scientist-lady said selenium was harmless, and nontoxic ( the bottle says differently!) because it is in seawater/ soil/ multivitamins.
while taking advice from experts on a webforum can be ok sometimes i would find out what local authorities suggest for disposal of photochemicals ( dev/ fix) and more exotics like toners ..
maris the " industry standard" is a gallon of well spent fix has a quarter ounce of silver in it .. you can argue all you want but that is the standard that wastehaulers go by ...
and as others have suggested the destruction caused by extracting silver from the ground is pretty hellish