Well, as i read through this post i notice a bit of conflicting information here. I am not going to get into a this is "wrong" and this is "right" argument because firstly that's subjective (some people really get results in ways that others don't i suppose) and secondly it's just plain counter-productive. But i will give my own advice and reasoning for how i do it and why i don't follow some of this other advice.
Lab grade arsenic tri-oxide does work best and it is the only method that will provide consistent results. This is because a gram of As2O3 is always the same exact strength each and every time, without any added impurities that might exist in all the various forms of realgar. The only disadvantage that i can see is that it is not always easy to obtain, but i managed to get a hold of some after only a few well placed phone calls, so don't give up if you want to try this. And yes, Michel, it would be in it's most potent form and therefore more deadly. My advice would be, don't stick it in you mouth and definitely don't shoot it in your veins and chances are good that you will be just fine.
Actually, i would have far more fear about grinding it up in a mortar & pestle, or even worse smashing it with a hammer
with pieces flying everywhere as this is more likely to make particles airborne and therefore breathable. If you are grinding this stuff up i would strongly recommend that you wear a surgical mask.
Michel, if you really need to let your solution rest for an entire year before using i see this as another advantage to using As2O3. I usually let mine settle over night and it's good to go. And i am not sure that i can see how letting the pulp rot adds to your acid PH or if that is even necessary if it does.
For those who what to use realgar i wish we could come to some agreement as to what color is best, because we are all over the map here. I have heard that purple is best, red is best, pink is best, orange is best and yellow is best. Well, only one can be best. If i were planning on using the mineral form i would be very confused right now.
