This listing is for a new lot of 3 Cupels Magnesia items intended for gold refining use. If you are sourcing basic refining supplies or replacing consumable materials in a workshop or lab setting, this set may be a practical option to consider. The listing also notes free shipping, which can help when comparing total purchase cost. Because detailed specifications, sizing, and material information beyond the name are not provided here, check the listing for full details before buying. This is most suitable for shoppers who already know the type of refining supply they need and want a straightforward new-condition set rather than a mixed or used lot. Cupels Magnesia Lot Of 3 For Gold Refining. Condition: New, Made in United States. Listed at 16.50 USD. Three usually do the job on up to 5 grams. Economical way to test your refining skills. Lead or bismuth work as the impurity removers. I was asked if you can refine with a torch and cupel. I tried it and failed with a mapp gas torch.