Silver Metalsmithing Techniques Reference — 8 Techniques × Tools / Steps / Temperatures / Failures

Tools

• Raising hammers (cross-pein, blocking, planishing) — typically 12–22 oz heads
• T-stake, mushroom stake, or sinusoidal stake mounted in a vise or stake-holder
• Sandbag and shaped wooden hollow (for sinking phase)
• Wooden mallet (rawhide or boxwood) for initial sinking — preserves sheet thickness
• Surface-plate / planishing hammer (8–12 oz, polished face) for final smoothing
• Dividers / scribe + steel rule for course-marking (1 inch concentric courses typical)

Procedure (7 steps)

1. Anneal the disk fully (see Annealing) and pickle. Mark concentric courses ~1 inch apart with dividers.
2. Sinking: drive the disk into a wooden hollow with a rawhide mallet to form a shallow bowl that fits the planned base diameter.
3. Raise: place rim at angle on a T-stake; strike just above the line of contact, working around the rim in a continuous course. Each course closes the wall slightly.
4. Re-anneal and pickle every 2–3 raising courses; skipping anneals will work-harden the silver and cause cracking.
5. Repeat raising until target form is reached. Silver typically takes 4–8 full anneal cycles for a 4-inch goblet bowl.
6. Planish: with the form on a smoothly polished stake, strike each square millimeter with a planishing hammer to set the surface and remove tool marks.
7. Final pickle, light file at the rim, then sand 220 → 400 → 600 grit before any polishing or chasing.

Common failure modes

• Cracking at the rim — caused by skipping an anneal cycle. Sterling work-hardens to brittle after ~30% reduction.
• Pleating / overlapping metal during raising — strike angle too steep, drove rim into itself instead of closing it.
• Stretched / thin walls — over-planishing at one spot, or planishing before raising is complete (locks geometry while still mid-process).
• Firescale (sterling) — over-annealing in oxygen-rich flame. Use a soft reducing flame and limit anneal hold time. Argentium does not firescale.
• Surface pitting after pickle — sulphuric pickle reaction with copper-rich oxide; use Sparex or citric pickle and brass tongs (not iron, which transfers copper to the bath).

Tools

• Cross-pein hammer (for drawing) and flat-faced forging hammer (for finishing) — 16–32 oz heads
• Steel anvil — bench anvil 25–50 lb sufficient for jewelry-scale silver work; ABANA-grade anvil for studio raising
• Hardy hole + bottom fuller, top fuller, and swage block for shaped sections
• Tongs sized to bar diameter (do not hold-and-strike; secure tongs always)
• Brass-jaw vise for holding heated billets at angle
• Pyrometer or color chart for tracking working temperature

Procedure (7 steps)

1. Cut and anneal the silver bar to required starting size. For drawing a 1/4-inch bar to a tapered point, allow 30–50% length increase.
2. Heat to working temperature (see temperature notes). Strike with cross-pein perpendicular to the bar long-axis to draw down.
3. Rotate the bar 90° between courses to keep the cross-section square; rotate-and-draw alternates between 'square' and 'diamond' cycles.
4. Re-anneal whenever the bar 'rings' rather than 'thuds' — that is when work-hardening has set in. For jewelry-scale silver, every 2–3 minutes of forging.
5. Switch to flat-faced hammer for finishing: planish each face to flatten cross-pein marks.
6. If a taper is required, draw the last 20% with overlapping diagonal strokes rather than perpendicular, which produces a smooth taper rather than a stepped one.
7. Quench, pickle, and finish with file (smooth-cut) and 220–400 grit emery before final polishing.

Common failure modes

• Cold-shut (a fold of metal hammered into the surface that does not weld) — caused by striking too far past working temperature. Cannot be repaired; must be filed away.
• Stress fractures along the long axis — under-annealing during drawing.
• Bar bowing (banana-shape) — uneven blow distribution, struck the same spot repeatedly without rotating.
• Hammer marks that won't planish out — too aggressive cross-pein on final courses; should switch to flat face for last 10%.
• Anvil rebound damage to wrist/elbow — anvil too small or not seated solidly; ABANA recommends ≥ 3× billet weight for the anvil.

Tools

• Torch — propane-air for sterling (sufficient for up to ~3 oz silver); propane-oxygen or natural-gas-oxygen for larger or thicker pieces
• Soldering pad — soft firebrick, charcoal block, or honeycomb ceramic. Charcoal reflects heat back to the workpiece (faster anneal of small parts).
• Cross-locking tweezers, third hand, or brass binding wire to secure flat parts that lift on heating
• Pickle pot — Sparex No. 2 (sodium bisulphate, ~1 lb per gallon water) at 140°F is industry standard. Citric-acid pickle is non-toxic alternative.
• Brass or copper tongs for the pickle bath (steel tongs transfer iron, contaminating the silver surface with a copper plate)
• Pyrometer or temperature-color chart (see Temperatures column)
• Quench bowl (water, separate from pickle) — for large pieces only; small parts are slow-air-cooled

Procedure (8 steps)

1. Place the piece on the soldering pad in a way that allows even heat distribution. Use binding wire to hold thin sheet flat if it tends to curl.
2. Darken the room or work in shadow — silver's annealing-temperature glow is faint and easily missed in bright light.
3. Apply a soft, slightly reducing (yellow-tipped) flame; play it across the entire piece in continuous sweeps. Do not focus heat on one spot.
4. Watch for the color change: sterling — dull cherry red; Argentium — barely-visible orange-pink glow; Britannia — slightly brighter cherry.
5. Hold at temperature for 30–60 seconds for thin sheet (≤ 1 mm); 60–90 sec for thicker stock. Over-holding sterling at red heat causes firescale; over-holding Argentium destroys its germanium passivation.
6. Remove flame and allow 30 sec air-cool before quenching. Argentium especially benefits from longer air-cool (the protective germanium-oxide layer forms during this window).
7. Quench in water (large pieces) or air-cool (small/delicate pieces). Pickle 5–15 min in 140°F Sparex until oxide is gone.
8. Rinse, neutralize in baking-soda water, and rinse again before continuing work.

Common failure modes

• Firescale (sterling) — black/grey copper-oxide layer 0.05–0.15 mm into the surface, only removable by depletion-gilding or aggressive sanding. Cause: over-anneal in oxidizing flame. Prevention: soft yellow-tip flame, limit hold to 60 sec.
• Loss of Argentium firescale-resistance — irreversible if heated above 1100°F. The germanium oxide layer is consumed; subsequent solder/anneal cycles will firescale like sterling.
• Cracking on next forming step — anneal incomplete (didn't reach temp, or held too short). Re-anneal and try again before continuing.
• Pickle reaction discoloration — copper plating from steel tongs in pickle. Replace pickle and use only brass/copper/plastic tongs.
• Solder joint melted during anneal — torch was too close to a previous solder seam. Anneal far from existing joints, or use lower-temp solder for the original join.

Tools

• Solder grades — IT (Extra Hard), Hard, Medium, Easy, Extra Easy. Each has progressively lower melting points; use Hard for the first joint, Medium for the second, Easy for the third on the same piece.
• Flux — borax-based paste (Handy Flux) or boric-acid + alcohol slurry. Liquid Battern's flux for thin sheet.
• Solder pick (titanium tip preferred — solder doesn't stick to titanium)
• Cross-locking tweezers, third-hand, or binding wire to hold parts in registration
• Same torch and pickle setup as annealing
• Solder pallions (small chips) cut with side-cutters — typically 1.5 × 1.5 mm for fine work, 3 × 3 mm for heavier joints

Procedure (7 steps)

1. Pre-clean both surfaces to be joined: file/sand to bright metal, degrease with denatured alcohol. Solder will not flow on oxidized or oily surfaces.
2. Flux the joint generously on both sides. Place pallions of solder along the joint line — typically one pallion per 5 mm of seam.
3. Pre-heat the entire piece (not just the joint) to ~400°F (200°C) until flux turns glassy. This boils off water without throwing pallions.
4. Bring the entire piece up toward solder-flow temperature with a sweeping flame, NOT a focused flame on the joint. Solder flows toward heat — concentrating heat on one side will pull solder away from the other.
5. Watch for the moment solder flashes silver and 'pulls' along the joint by capillary action. Lift the flame the instant the seam fills.
6. Air-cool 30 sec, then water-quench (sterling) or extended air-cool (Argentium). Pickle to remove flux glass and oxide.
7. Inspect the joint: solder should be flush, no pinholes, no excess fillet on either side. If there are gaps, re-flux and re-flow with the same or one-step-lower solder.

Common failure modes

• Solder won't flow — surface dirty or flux burned off. Re-flux, re-clean, retry.
• Solder balls up and rolls off — joint not pre-heated; solder reached liquidus before workpiece, surface tension keeps it as a sphere.
• Solder flowed only one side of the joint — uneven heat. Solder flows TOWARD heat; if the back side is cold, solder stays on the front.
• Solder seam appears in next anneal — common with low-grade solders (Easy, Extra Easy) when subsequent heat exceeds their melting point. Plan solder grade ladder in advance.
• Pin-holes in finished joint — out-gassing from contaminated metal or stale flux. Fresh flux + clean metal prevents this.
• Joint cracks under stress — under-soldered (gap not filled completely), or solder under-flowed because of insufficient heat soak.

Tools

• Chasing hammer — wide, slightly domed face; light (4–8 oz) for control
• Chasing tools (punches) — typically 30–60 in a complete set: liners (line tools), planishers, modelers, matters (texture), shaders. Custom-ground from W1/O1 tool steel.
• Pitch bowl — half-sphere (often a bowling-ball half) filled with chasing pitch (asphalt/rosin/wax mixture). Holds the work in any orientation.
• Pitch — Northwest pitch is the most common studio standard; Northern (cooler-melting) for fine detail in summer studios
• Heat gun or alcohol lamp to soften pitch when re-positioning the work
• Tracer / scribe to transfer the design to the silver
• Annealing setup — pitch must be cleaned off before each anneal (use turpentine + heat)

Procedure (8 steps)

1. Anneal the silver sheet (typically 0.6–1.0 mm / 22–18 gauge for repoussé, thinner for chasing).
2. Trace the design on the FRONT in scribe or marker.
3. Set the silver face-DOWN into warm pitch, press flat, allow pitch to cool/grip.
4. Repoussé phase: working from the BACK, drive a liner along the design lines to push them outward. Hold the punch at slight angle, walk it along the line with rapid light hammer taps.
5. Refine outward forms with modelers (curved-face punches) — push the design into 3D relief from the back.
6. Re-warm pitch, release, anneal, clean residue, flip work.
7. Set face-UP in pitch. Chasing phase: working from the FRONT, refine the design with liners, planishers, texturizers. The back relief is now defined; chasing sharpens it from outside.
8. Anneal as needed (every ~30 minutes of bench work). Final pitch removal: gentle heat + turpentine, then degrease in alcohol.

Common failure modes

• Punch breaks through the silver — sheet too thin OR punch landed on a previously-chased line (cumulative thinning).
• Design 'spreads' from intended path — punch held at wrong angle, or hammer blows too heavy, displacing metal sideways.
• Pitch chips off — pitch too cold/hard. Heat-gun briefly to soften before continuing.
• Pitch contaminates the silver surface — incomplete pitch removal before anneal will firescale-bake the contamination in. Always clean to bright metal before heat.
• Detail flattens during planishing — chasing details should be added LAST; planishing afterward erases them. Order: raise → planish → chase.
• Tool-mark 'orange peel' on flat areas — punch face damaged or contaminated. Re-polish punch face on 600/1200/2000 grit + buff.

Tools

• Wax — hard carving wax (blue/green), soft injection wax (pink), sticky sprue wax. Each has different working properties.
• Wax-working tools — heated wax pen (~150°F), carving spatulas, dental tools, alcohol lamp
• Sprue base + steel flask (cast-iron typical, 2.5–4 inch diameter for jewelry)
• Investment powder — plaster + cristobalite mix (Kerr R&R, Plasticast). Mix ratio 38–40 parts water to 100 parts powder.
• Vacuum chamber — for both investment debubbling AND post-burnout casting (centrifugal also acceptable)
• Burnout kiln — programmable, capable of 1350°F
• Crucible (graphite or ceramic) and casting torch (oxy-acetylene or oxy-propane) — silver melts at 1763°F (sterling)
• Quench tongs and pickle setup

Procedure (8 steps)

1. Carve or build wax model. Allow ~5% shrinkage compensation (silver shrinks ~5% solid-to-room-temperature).
2. Sprue: attach 2.5–3 mm wax rods from the model to a sprue base. Sprues should taper UP to the model (so molten silver flows downhill) and form a 'tree' for multi-piece flasks.
3. Mount in flask, weight to verify, calculate silver weight: silver_weight ≈ wax_weight × 10.5 (specific gravity ratio).
4. Mix investment under vacuum (debubble 90 sec at 28 inHg), pour into flask, vacuum debubble flask 60 sec.
5. Bench-set the investment 1–2 hours, then begin burnout: 300°F (1 hr) → 700°F (1 hr) → 1350°F (2 hr) → cool to 900°F.
6. Cast at flask temperature 900–1000°F. Heat silver in crucible to bright orange-yellow (about 1900°F for sterling), with covering flux (boric acid + borax). Pour or vacuum-cast.
7. Cool 5–10 min, quench flask in water (the thermal shock breaks investment off the casting).
8. Pickle, cut sprues, pre-finish: file, sand 220 → 400 → 600.

Common failure modes

• Incomplete fill (rounded edges, missing detail) — flask too cold, silver too cold, or sprue too small.
• Investment cracks during burnout — heated too fast (esp. 200–400°F where chemical water boils off). Slow ramp.
• Porosity / pinholes in casting — silver overheated (boiled off zinc/copper), inadequate covering flux, or out-gassed wax residue.
• Investment break-out / silver sprays — flask thermal-shocked too fast, or sprue acted as a missile under vacuum pressure.
• Surface 'fish-scaling' or rough texture — investment broke down, or silver reacted with mold gases (incomplete burnout left carbon).
• Casting too small / undersized — forgot to factor wax+silver shrinkage; cumulative ~7% smaller than wax model.

Tools

• Bench vise (smooth jaws, 4–6 inch)
• Rolling mill (highly recommended, not strictly required) — flat rollers, hand-cranked sufficient for jewelry-scale
• Cross-pein hammer (16–22 oz), planishing hammer
• Wide-jaw pliers (parallel-jaw or flat-jaw) for unfolding
• Standard annealing setup (annealing is more frequent than any other technique)
• Mallet (rawhide) for initial fold-flattening

Procedure (8 steps)

1. Anneal a sheet (typically 0.5–0.8 mm / 24–22 gauge silver). Pickle, dry.
2. Crease the sheet by folding it sharply along a planned axis — finger-press, then close in a vise (fold should be 'painted' flat).
3. Optional: pass the closed fold through a rolling mill at progressively tighter spacing (4–5 passes from open to fully closed). This is the canonical Lewton-Brain method.
4. OR: hammer the closed fold along its edge with a cross-pein hammer (the hammer face oriented along the fold-line). Each blow stretches the metal AT the fold, while the metal interior remains undeformed.
5. Anneal — fold-forming work-hardens the silver heavily and quickly.
6. Unfold using wide-jaw pliers, slowly opening the fold. The hammered edge has stretched, so the sheet now warps into a 3D form (curved leaves, ruffles, shells).
7. Refine: planish where needed, but preserve the fold-formed character (over-planishing erases the technique's signature look).
8. Multiple folds can be combined — Lewton-Brain catalogs ~20 named fold-forms (T-fold, plier-fold, inverted-fold, etc.).

Common failure modes

• Cracking at the fold — under-annealed, or fold made on cold work-hardened metal.
• Asymmetric unfold — uneven hammering (one end of the fold thinned more than the other). Aim for even distribution along the fold-line.
• Fold-line creases that won't open — over-hammered the closed fold. The fold is supposed to flatten and stretch its EDGE, not be welded shut.
• Loss of definition after annealing — the fold-form 'memory' is in stress patterns; annealing relaxes them. Anneal SHORT (30 sec hold) and watch for the form to slightly settle.
• Wave-distortion across the sheet (not desired) — initial sheet was not flat / was not annealed before first fold.

Tools

• Jeweler's saw frame — adjustable type, 3 inch throat for normal jewelry, 6 inch for large work
• Saw blades — typical size index: 6/0 (finest, 0.18 mm thick) → 2/0 (medium) → 3 (coarse, 0.45 mm). Match blade size to silver thickness: 3 teeth on the metal at all times is the rule of thumb.
• Bench pin (V-cut) and clamp — wood, replaceable
• Lubricant — beeswax block, Bur-Life, or 3-In-One light oil
• Pin-vise + small-diameter drill bits (0.6–1.0 mm) for starting interior cuts
• Flat / half-round / needle files for cleaning sawn edges
• Light source — task light required; sawing in dim light is the #1 cause of broken blades

Procedure (8 steps)

1. Select blade size: silver gauge ÷ blade-tooth-count rule (Tim McCreight chart). For 1 mm sheet, use blade 1/0 or 2/0.
2. Mount blade in saw frame: teeth point DOWN and OUT toward you. Tension: blade should produce a clear musical 'ping' when plucked.
3. Lubricate blade (beeswax pass). Mark the cutting line on the silver with scribe or fine marker.
4. Position silver on bench pin so the cut-line is over the V-slot. Hold the saw vertical, the blade perpendicular to the silver.
5. Stroke the saw with the full length of the blade (1.5–2 inches per stroke) at moderate speed (~60 strokes/min). Cut on the down stroke; minimal pressure on the up stroke.
6. For interior pierces: drill a starter hole inside the area to be removed. Thread the saw blade through the hole, re-mount in the frame, and saw out the shape from inside.
7. Turn the work, NOT the saw, when changing direction. The saw frame stays vertical; the silver rotates against the bench pin.
8. File and sand the sawn edges: flat file → 220 emery → 400 emery → 600 emery before any further finishing.

Common failure modes

• Broken blades (most common failure) — caused by twisting the saw rather than the work, by aggressive forward pressure, or by under-tensioning the blade.
• Wandering cut — blade dull or following the metal grain (less common in silver than steel). Replace blade.
• Edge chip-out on thin gauge — blade too coarse for thickness; switch to finer blade.
• Heat-discoloration along the cut — blade running too hot from inadequate lubrication. Re-wax every 1–2 inches of cut.
• Cut deviates from line — held saw at angle rather than vertical, OR insufficient lighting.
• Internal pierce ragged at start-hole — used too-large drill, leaving a gap. Use the smallest drill that the saw blade will pass through (typically 0.7–0.9 mm).