I just bought a bottle of ferric chloride from Radio Shack and the disposal instructions on the bottle said to flush it down the toilet.
I saw that and dumped it down the stainless steel sink anyway. Did
you know that Ferric Chloride etches stainless steel? It was only
there for a moment on its way down the drain, but there’s a definite
permanent slightly frosted look where it puddled in the sink on its
way down the drain.
My only excuse is that I had neutralized it with baking soda - I
thought it was safe. Evidently not. Another day, another lesson
learned.
Linda