Proffshuggarn
I know it’s out there, somewhere..
Of course I had to film my first silver cementation today Sorry if the video is a bit fast. The process on the film took about 20-25 minutes.
View attachment IMG_5201.mov
The material is 25g trimmed contact points from 3 safety switches that were put in a Sony SRX Robot Controller unit (Have 18 units left ).
Even though I trimmed the contact points, it took two long nitric leaches before there was only silver and actually some gold left.
Today's lesson for me is that dilute nitric acid first attacks the base metal, in this case mostly copper, because I was surprised that the first two nitric leaches did not show the slightest sign of silver nitrate when I added sodium chloride (took regular table salt without iodine in saturated solution) in a test tube.
After the second nitric leach, I filtered the entire solution twice and washed the clean silver dots before the next nitric acid/distilled water treatment, which dissolved the silver, with an extreme cottage cheese reaction in the test tube after filtration.
The solution fit in an old bottle for olive oil (cleaned of course) and I had to heat and roll up a copper plate to get it into the bottle.
Great fun to succeed. Hope the video will be good when I upload it.
/Dennis
View attachment IMG_5201.mov
The material is 25g trimmed contact points from 3 safety switches that were put in a Sony SRX Robot Controller unit (Have 18 units left ).
Even though I trimmed the contact points, it took two long nitric leaches before there was only silver and actually some gold left.
Today's lesson for me is that dilute nitric acid first attacks the base metal, in this case mostly copper, because I was surprised that the first two nitric leaches did not show the slightest sign of silver nitrate when I added sodium chloride (took regular table salt without iodine in saturated solution) in a test tube.
After the second nitric leach, I filtered the entire solution twice and washed the clean silver dots before the next nitric acid/distilled water treatment, which dissolved the silver, with an extreme cottage cheese reaction in the test tube after filtration.
The solution fit in an old bottle for olive oil (cleaned of course) and I had to heat and roll up a copper plate to get it into the bottle.
Great fun to succeed. Hope the video will be good when I upload it.
/Dennis