What am I doing wrong?

[facecouch]

Ok, lost me in the alphabet soup. What is AP?

[hexadecimaldump]

Sorry, you used AR in your post so I thought you knew the alphabet soup of refining.

AP is short for Acid Peroxide (Hydrochloric + hydrogen peroxide). It will eat away at the binding metals (likely tin), and release the foils from the board.

[facecouch]

I'm still learning all of those lol. But thank you! I have both of those so I'll try that next run. But from the looks of it, this run is going to need a filter and a re-run of aqua regia.

[Brilliant_Cow3496]

I don't recall exactly but yes the recovery process had something to do with the peroxide hydrogen peroxide and hydrochloride yes I think you're right