PRODUCT DETAILS Urea, pH balancer. 8 ounce bag of prilled urea. 99% pure CO(NH2)2 . Urea has several uses in precious metal refining with aqua regia. Add to the filtered AR solution to adjust PH.JSP® Urea -Aqua Regia 99% Pure for gold refining 8 ouncesThis listing includes:- (1) JSP 8 oz bag of UREA-AQUA REGIAA MUST-HAVE for anyone who works with gold, silver, jewelry, or metals!If you have any further questions, please feel free to contact us. We look forward to serving you in the future.