Soldering & Brazing related issues

How to Charge your Solder Pot

Today I’d like to share/blog/repost a question we received via email over the weekend from a lead technician using our new MiniPOT.  (Model MP-9)

Greetings. I work as an electronics technician and we recently bought your miniPot.  It has come to my attention that a spool of solder was introduced into the pot for its initial charge. I understand that there was yellow bubbles forming at the top and some black residue jumping out of the top. I have never set up my own solder pot so I want to know is this normal? Was the wrong type of solder used? Was there damage likely done to the crucible’s surface? I have attached a photo with the solder cooled down and the solder used.  Any information would be greatly appreciated.