Finally, a convenient gold purification step was developed for crude gold isolated from poly-1-Au or poly-2-Au. Here, the crude gold product is simply re-leached using the same TCCA/NaBr system and then reductively precipitated back to gold metal through its well-known reaction with ascorbic acid (vitamin C) (Fig. ) . Here, ascorbic acid is highly effective in both quenching the leach solution and reductively precipitating gold. When the leach solution is enriched in gold, this is an effective clean-up method before further refining by traditional techniques. With integrated methods now established for gold leaching, selective sorption, and final recovery and purification, their application to gold recovery from multiple real-world sources was demonstrated next.