After extracting the gallstones from the cattle there are washed thoroughly with cold water to remove blood clots, impurities etc. After washing they are dried for two to three weeks in a dark and well-ventilated environment at a temperature of approx. 20 degrees Celsius. The stones have to be moved regularly for better drying and to avoid them sticking at each other. After full drying, the stones are packed in hermetically sealed bags.
Quality and classification
The highest demand is for stones with the following features:
yellow golden orange colour;
stones with low specific weight;
large stones;
bilirubin content not less than 35%;
There is a demand for dark stones as well, but prices are considerably lower, however.

Stones are traded in the following specifications:
100% whole stones
90% whole stones / 10% broken
80% whole stones / 20% broken
70% whole stones / 30% broken
60% whole stones / 40% broken
100% broken stones
100% ox gall powder
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