Aqua regia gold refining supply kit, 2x 1/2lb bags +Stannous Chloride with instructions.

Kit contains 1/2lb pack of nitric acid substitute to be mixed with hydrochloric acid. This is used to dissolve gold for later precipitation. plus 1/2 lb 99% pure prilled Urea, pH balancer. Used in precious metal refining with aqua regia. Added to the filtered solution to balance pH. plus Stannous Chloride, gold/silver/platinum detector. Premixed liquid. An absolute necessity to make sure you have dropped all the gold from your aqua regia solution before you discard it.