Sid, if you are doing exactly what is in my instructions, and you're not getting a stain, it might be because:-
1) you are not repeating the process enough times --- often staining is not a quick job, even with lab quality arsenic I put aside a full half day to complete the job, sometimes it might only take an hour or so, but other times it can take more than a day
2) weather conditions are unfavorable
3) the realgar is no good.
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