A few times it doesn't. But if you live with it regularly within, say, reasonable limits and not every day, it can be quite toxic in the long run. I think that due to its relatively simpler synthesizing process, most of the amphetamine sulfates on the market are made with this synthesis. I think a similar proportion comes out the other way around, if we look at how many people don't give a shit about how much mercury remains in the finished product, among those who make it and then scatter it on the street.
I hope that the principles formulated by BB will be examples to be followed in the future, for the next generations. It will be a silly word for this, but I think the best thing would be if BB was able to create a "fashion" defining a new era, out of the pursuit of quality. It is almost impossible to influence the attitude of those people who see it more simply and/or because they are profit-oriented at any cost... or the other extreme, whose own limitations hinder their development. Except that they will be forced to follow the trends and thus the needs of the changing market.
But back to mercury, I fear it too. It's true, I have a frightening example that happened to a family member in the past.
Mercury is a heavy metal, in most cases it is not even excreted from the body, thanks to the half-life of 20+ years, as is typical for heavy metals. The net is full of methods for detoxification, I even found a detailed description of it here on the forum, but it is a lot of work. If it accumulates in us, it can cause serious problems. We know that it enters our bodies on a daily basis, just like lead and everything else. But it's one thing that you get it indirectly, and it's another thing that you do it as a cure, which could otherwise be avoided.
I'm not a chemical engineer, I just guess that the mercury present during the reaction mostly remains in the slag formed by the separated layers. And the purpose of repeated washing can be, among other things, to maximize the removal of mercury contamination. But I guess there is no guarantee that it will disappear completely.
Don't get me wrong, I wasn't trying to lecture you. I meant only those forum members who are curious about the topic. In this way, they can create an image of this based on several points of view.