Is this gold plated?

[haveagojoe]

sorry, correction - don't use a bubbler if you are just dissolving solder into HCl. if you do there is a risk you might introduce enough oxygen to start dissolving copper and forming copper chloride, which will dissolve all the rest of the copper and release the foils into the solution. you don't want that yet. just plain HCl, heat if you want to speed it up, then when the solder has dissolved, decant the HCl and replace with your AP solution to dissolve the copper and release the foils into relatively clean solution.

 

[patnor1011]

Some version of old czech tesla relays used 14 karat gold buttons as contact points.