Realgar is a mineral that is available to mineral collectors. Some people have mentioned this as being the true "warangan" that we use in Jawa.
I know nothing about it and have never used it. Two people who I know who have tried it have both had no success in using it.
Ferric chloride which is available as a circuit board etchant, and is used by custom knife makers to etch damascus steel will give you a result. It will not give you the correct result, but it is easy, and better than nothing.
Industrial arsenic is not an option. It must be laboratory quality.
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