Where the
world gathers for metal finishing
Q&As since 1989


-----

Recovering silver from old resin filled sterling items

I have several old pieces of silver including several flatware knives that are beyond use for anything but scrap. These are resin filled and I would like to know the best method of removing the resin. there must be a simple method involving heat but I do not dare use an open flame. Would appreciate any guidance. Thank you for your attention.

Jon Scarborough
retired - Melrose, Massachusetts, USA
June 28, 2010

---

First of two simultaneous responses --

A vented high temp oven/furnace/muffle should work. Expect some carbon yuk on the silver unless you take it to melting temp.

James Watts
- Navarre, Florida
June 29, 2010

---

Second of two simultaneous responses --

Try immersion in acetone [on eBay or Amazon] or white spirit(2-3 days at least). Immersion in boiling water can be useful too. Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia
June 30, 2010

---

First of two simultaneous responses -- June 30, 2010

If the knives are truly filled with resin and not plaster, you can incinerate them. The stainless blade will then easily pull out and you can knock out most of the remains of the resin.

The cleanest way is to make a cut in the sterling foil and then use a pair of pliers to peel it off. Wear leather gloves because the foil is sharp. By peeling it, you end up with very clean sterling.

The sterling foil should run 92.5% silver or a little less.

Chris Owen
- Nevada, Missouri, USA

---

Second of two simultaneous responses --

A no brainer simple method is a few whacks with a hammer on all sides which will loosen the handles and break up the old resin or plaster inside the silver pieces. Dump out the broken resin or plaster and recover the silver. The resin is usally quite old and brittle and will break up fairly easily. The handles will often split during hammering allowing easier access to the filler material.

Good luck & Best regards,

Jim Sivertsen
Refining & Alloys - Alden, New York
June 30, 2010

Many thanks to you all, I am grateful for all the suggestions.

Jon Scarborough
- Melrose, Massachusetts
July 12, 2010