Tatyana, if you are using realgar, always use the red or deep oranges with some yellow ones. The less the yellow, the better. the deeper the red and orange, the better. Purple is the best, but it's hard to find. The good one should shows crystalline structure, and easy to pulverize using the pestle and mortar. As Marcokeris already warn, it would quickly transfered to a poisonous arsenic gas if you burn it. Never try the white or gray, or pure yellow. Pulverize and mix it with the lime juice, and let it rest for at least a night before use. During use, the the solution's color may change to a brownish color. The older the solution, the deeper the color. Do not throw away the old solution. It's a 'babon warangan', or 'mother solution'. If you use the brushing technique, you should mix the babon with some new one. Immersion technique use a deep brown, almost black solution. Finding the right solution is part of the art. Keep away the solution from oil, copper alloy and soap. Just put some rusty nail and let it rest for a night to make an old solution from the new one, quickly.
Happy marangi, and beware of it's health hazard.
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