It definitely doesn’t look good. Your comment about it turning things black reminds me of the “inky caps” aka “lawyers wig.” I have eaten those.
A few years ago I took a test/got a license for the State of Michigan that allows me to sell wild foraged mushrooms. The interesting thing was that people from other states travel to Michigan to get the license. In my group there were people from Pennsylvania, Indiana, and Illinois. Most states don’t have such a program. I guess businesses in other states aren’t willing to buy wild foraged mushrooms from you unless you have a piece of paper from the government saying you are an “expert.”