It is not as if I wasn’t warned. While mixing up some of the noble metals* for the Ware process, I used a stainless steel digital thermometer with a magnetic stirrer. The palladium powder, which needs to be at 165 -170 degrees fahrenheit in order to dissolve, reacted with the metal in the thermometer. Fortunately I was able to filter out the reacted metal, but it went right through my Whatman number 1 paper filter. Ouch! It, therefore, left a metal deposit in my fritted filter. I tried to dissolve the offending material with muriatic acid but to no avail. I had to use 70% strength nitric to dissolve it.
Lesson learned! Anybody know of thermometers that are coated with TFE (Tetrafluoroethylene) i.e. Teflon?
*This is slightly misleading. The nobel metals wish to be in their metallic form like we find in jewelry; however, we alternative process practitioners use one of the highly reactive forms such as gold chloride or palladium chloride. When these metals react, they plate themselves pretty much on anything, paper, fingers whatever. Ironically, they turn black not gold, or silver.