Allurr
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it can be converted into gold for a fee:
-you can charge for the ability to convert each time it's visited.
-you can charge once a day when visiting.
-you can charge a fixed amount for each conversion operation.
-you can charge an amount proportional to the converted units for each conversion operation.
-...
Only this way. You pay the alchemist with a minted coin - he performs the transformation, if you don't pay, he doesn't. It's atmospheric and the principle of losses in the exchange operation is observed.