Jewelry Design Jewelry Finishing and Surface Treatments 1 — Questions and Answers
Question 1: What is the primary purpose of the pickling process in jewelry making?
- To add color to metal surfaces
- To remove oxides and flux residue from metal after soldering (Correct answer)
- To permanently harden the metal
- To add texture to the surface
Correct answer: To remove oxides and flux residue from metal after soldering
Pickling uses an acidic solution (such as sodium bisulfate or sulfuric acid) to dissolve oxidation and flux residue left on metal after soldering or heating.
Question 2: Which finishing technique uses a rotating wheel loaded with abrasive compound to bring jewelry to a high shine?
- Tumbling
- Sandblasting
- Buffing (Correct answer)
- Planishing
Correct answer: Buffing
Buffing uses rotating wheels impregnated with abrasive compounds such as tripoli or rouge to polish metal to a bright, high shine.
Question 3: What effect does liver of sulfur (potassium polysulfide) create on silver jewelry?
- A bright, reflective finish
- A gold-colored coating
- A dark brown or black patina (Correct answer)
- A matte, frosted surface
Correct answer: A dark brown or black patina
Liver of sulfur reacts with silver to create a dark brown to black patina that adds depth and an antique character to the piece.
Question 4: Reticulation is a surface treatment technique that produces what kind of effect on metal?
- A smooth, mirror-like finish
- An organic, wrinkled texture on the surface (Correct answer)
- A uniform colored enamel layer
- A grid of evenly spaced dimples
Correct answer: An organic, wrinkled texture on the surface
Reticulation involves heating a specially prepared silver alloy to near its melting point, causing the surface layer to flow and wrinkle into a distinctive organic texture.
Question 5: Which metal is most commonly electroplated onto silver jewelry to prevent tarnishing and improve its white, bright appearance?
- Gold
- Copper
- Rhodium (Correct answer)
- Nickel
Correct answer: Rhodium
Rhodium, a platinum-group metal, is widely plated onto silver jewelry because it is highly resistant to tarnish, corrosion, and scratching.
Question 6: What is the purpose of annealing metal during jewelry fabrication?
- To add a decorative color to the surface
- To permanently harden the metal
- To relieve internal stress and restore malleability after work hardening (Correct answer)
- To apply a protective chemical coating
Correct answer: To relieve internal stress and restore malleability after work hardening
Annealing involves heating metal to a specific temperature and allowing it to cool, which relieves internal stresses caused by manipulation and restores the metal's workability.
Question 7: What is the defining characteristic of the burnishing technique used in jewelry finishing?
- It removes metal using abrasive particles
- It uses a hard, smooth tool to compress and polish the metal surface (Correct answer)
- It applies heat to melt the surface layer
- It uses chemical reactions to create shine
Correct answer: It uses a hard, smooth tool to compress and polish the metal surface
Burnishing uses a hard, highly polished steel or agate tool rubbed firmly across the metal surface to compress and smooth it, creating a bright finish without removing material.
Jewelry Design Jewelry Finishing and Surface Treatments 1
What is the primary purpose of the pickling process in jewelry making?