Shor has refining systems for gold, platinum and silver. Our gold and platinum system, the Simplicity, works without any acids. We strongly recommend the Simplicity refining system over any type of acid refining system. It is far safer, cleaner and easier. However, we carry supplies for acids systems as well. Our Storm Precipitant, for example, works very well in all acid type gold refining systems. It's far less expensive and has a virtually indefinite shelf life. Additionally, should you wish to construct your own acid type refining system, we have instructions for setting up and running.