Printing plates
Wear rubber gloves and have a bowl with baking soda and water solution nearby to neutralize the acid.
The black and gold would need to be tested,no one can tell from a photo.What is stamped in the rectangle on the back side.
Depending on where you live there may be an area near you. Some areas the owners dig the material and people just wash and sort the material...
Looks like a replacement hinge soldered with lead solder.
Many stones cannot be identified by just looking at a photo.Experience actually digging the stones and processing them.I started digging in mine...
Is the black part magnetic?
The stones are not onyx,onyx is a quartz stone.The stones in the bracelet are travertine,a type of limestone.
No,both are fairly common stones.
The stones look like dyed travertine/Mexican onyx.
In the photo it appears the stone's girdle is sitting above the bezel,the girdle must be below the top of the bezel to work.Can you take a side...
Waste basket
I'm not familiar with the term "squeeze blind bartack".
Is the blue stone glued to the top of the bezel?I don't see anything holding the stone in the photo.
Looks like someone was playing with black paint and not a good patina solution.
The links are poorly soldered,I have never seen bad soldering on a commercial chain.
The chain appears to be "homemade",probably by the same person who soldered the ring to the pendant.
The top bracelet is nearly impossible to date with out a maker's mark.People still make them with the original 100+ year old dies.see link....
Looks like the top bracelet originally had a box clasp.
These are overlay I made a number of years ago. [ATTACH]
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