Realizing that you want to be safe and cautious, I HIGHLY recommend that you do more research in the use and possession of acids. NO - do not contain or store aqua regia in a stopper bottle. It will explode.The whole procedure of extracting precious metals from items at a high purity level also says it must be done by an exact and unforgiving method. Aqua Regia is NOT a play toy. So if you value your life and the lifes of those around you, do more research and do not attempt anything until you are sure you have the answers to your questions. Aqua Regia is a wonderful and fulfilling science and loads of fun if you do it right. By the way, I have been doing this for over 20 years and have yet to be careless or have an accident. Slow, patience, exact and knowledge is the key. Also be advised, I am still learning.
