Plastic drypoint and intaglio comparison

Before teaching

• Choose actual school-approved products; read current labels/SDS and school requirements.

• Pilot the chosen hands-on method and document real failures, quantities, timings, drying/release and accessibility.

• Verify equipment, supervision, handling, waste and incident procedures.

• Apply lab-specific fallback whenever procurement, source visibility or safe-transfer conditions cannot be met.

Lab-specific review

• Exact PETG, ink, paper, dampness, wiping and print system require a documented actual-stock pilot and school approval.

• The current manufacturer guide download and actual ink SDS need checking; indexed historical guide access is not current equipment approval.

• Keep Proof 2 within one approved variable; a matrix alteration is a new state and a different comparison.

• There is no universal safe roller setting or plastic-plate edition size.

Teacher preparation

Preparation allowance: 60–90 minutes after a complete actual-materials pilot. School safety approval, a trained operator, and suitable maintained equipment are necessary for the chosen physical process. The historical chapter itself remains teachable if those conditions are unavailable.

Before use, inspect current labels and safety data for the precise ink and color, the plate specifications, needle design, manufacturer press instructions, paper compatibility, and waste requirements. Select protective equipment through the local assessment rather than treating a marketing term such as “non-toxic” as a guarantee of unrestricted use.

Purchase precut plates or have a trained adult prepare and finish their edges. Inspect for cracks, sharp perimeter edges, and protective film. Establish a stable supporting board and nonslip grip arrangement. Never substitute broken CDs, unknown plastic, or thin sharp metal.

Teacher pilot: Make a small line-density sample; record the actual plate thickness, needle, stroke behavior, ink charge, fabric, wiping, paper preparation, approved press setting, packing, drying, and cleanup. Verify actual transfer from recesses. A plate mark or blind embossing is not enough. Do not invent universal pressure settings or a fixed soaking time for every paper.

Needle control: Count needles before and after the session. Teach the direction of strokes, safe supporting hand, stationary work, and immediate return to the rigid container. No exposed needle enters the press queue. Stop if a point slips repeatedly, the student uses excessive force, or the plate flexes or cracks.

Press control: A trained adult operates the press, including adjustments and any problem recovery. Set up a one-way route from plate inspection to inking/wiping, press, then drying/recording. Students keep clear of moving components and nip points. At an estimated 2–3 minutes of press handling per plate, 12 impressions need 24–36 minutes if already prepared; inking and cleanup occur separately. Actual throughput controls the lesson length.

No-press route: Use only a purpose-designed compatible hand-printing system that has produced legible inked lines in a prior teacher trial. If it fails, use a demonstration and a documented professional sample. The lesson excludes improvised jack, hydraulic, pasta-machine, and clamp presses. A failed hand trial is a useful equipment finding, not permission to increase force without guidance.

Chemical boundary: Explain etching historically without supplying or allowing bath recipes, mordants, household-acid substitutes, chemical grounds, electro-etching, heating, or disposal shortcuts. No student chemical etching occurs.

Access: Provide non-incising roles, pre-prepared plates, audio descriptions, a low-force layout role, and partner handling as needed. Participation should depend on evidence and explanation rather than hand strength or comfort with a sharp tool.

Schedule and equipment queues

1. History and design: 12 minutes technique/object comparison; 8 safety and demonstration; 20 drawing and tone plan; 10 setup/record.
2. Plate making: 8 minutes test marks on teacher sample; 27 incision; 5 inspection; 10 tool count and cleanup.
3. First proofs: 8 minutes inking/wiping demonstration; approximately 30 minutes scheduled printing while other pairs prepare or analyze; 12 cleanup and observations.
4. Second proofs and explanation: 8 minutes one-variable plan; approximately 30 minutes second printing; 7 cleanup; 5 individual exit response. Longer written comparison can be homework or a fifth lesson.

Alternative material plans

Compatible proven hand-printing system

• Purpose-designed pin press or compatible hand-print system

  Not specified system · class

  Exact quantity and throughput depend on teacher-piloted approved model

Use a purpose-designed pin press or teacher-piloted hand-printing system compatible with the plate and ink, following its instructions. The manufacturer's documentation allows plastic-plate drypoint and specifies paper choices, but transfer quality still depends on the actual setup. [T6, T9] Keep the plate small. Do not promise that an ordinary rolling pin or spoon will reliably draw ink from fine recesses. If a pilot cannot achieve readable lines, run the plate-making/inking comparison as a teacher demonstration and supply a professionally printed sample for analysis; label the limitation. Never improvise a car-jack, hydraulic, pasta-machine, or woodworking-clamp press in this curriculum.

An embossed depression in paper without transferred ink is not a successful inked intaglio print. Students must identify actual ink transfer from the incisions, separately from any plate mark or blind embossing. A faint line is a result to analyze, not grounds to relabel embossing as printing.

Editorial corrections

The current student procedure is the teaching baseline.

Safety and stop conditions

Read these controls with the teacher before handling materials. Chemical etching is historical context only; the practical intaglio activity uses drypoint without mordants.

Controls

• Class of 24, working as 12 pairs; six washable workstations, each shared by two pairs.

• Room has handwashing, stable tables, drying space, accessible routes, and a teacher who can supervise the chosen tools.

• The drypoint option assumes one proper, maintained etching press operated only by a trained adult under the school's procedures. A no-press alternate is described separately and must be piloted.

• Sizes and stock estimates are intentionally small. Scale consumables by student count divided by 24, rounding upward. Equipment quantities depend on throughput, not simply headcount.

• No food or drink. Aprons are protective workwear, not proof that a product is safe. Read current product labels and safety data sheets; follow the school's risk assessment and disposal rules. The CPSC guide is a general starting point, not a substitute for local approval. [S1]

• Maintain separate clean-paper, ink, and wet-cleanup zones. Cover tables. Take ink residues off tools with scrap first; dispose of residues according to school policy before washing. Do not assume “water-washable” authorizes pouring concentrated ink into a sink.

• Students may work as designer, recorder, proofreader, or paper handler when a physical operation is inaccessible. Participation and historical reasoning must not depend on grip strength or speed.

• Photograph only student work and hands when school permission permits. Do not publish names or images without the school's normal consent process.

• Use purpose-made PETG only; inspect edges and cracks, stable nonslip backing, safe grip, short controlled strokes away from fingers.

• Keep tools counted and in rigid lidded storage; return needles before entering ink area or press queue.

• Do not feel incisions with a finger; clean plate edges/back; blot paper until no free water remains.

• Operate one-way queue: inspected plate, ink/wipe, adult press, drying/recording; keep people clear of nip points.

Stop when

• Unknown or unsuitable product, missing risk assessment, damaged tool/material, unsafe station, discomfort, or failed actual-stock pilot: pause and use approved alternatives.

• Queue or cleanup time exceeds safe schedule: extend the lesson rather than rush.

• Point slips repeatedly, plate flexes dangerously or cracks, or tool/material mismatch occurs: stop; replace approved materials or use non-incising role.

• Ragged paper, sharp plate mark, suspected unsafe edge or excessive pressure: stop; adult inspects before another pull.

• Jam or unsafe press behavior: students do not reach, adjust rollers or pull jammed paper; adult follows equipment procedures.

• Pilot cannot achieve readable ink transfer: use compatible proven hand system or demonstration/sample-analysis fallback; blind embossing is not inked intaglio.

Trained adult only

• Teacher pre-cuts stock, selects actual products and SDS, approves setup and waste management, and pilots transfer.

• Maintained etching press installation, inspection, adjustment, all operation and jam response.

• Plate cutting/edge finishing, actual ink/paper/wiping/press pilot, risk assessment and controlled sharp-tool issue/count.

Excluded activities

• Student carving knives/gouges in the foam and movable-block exercises.

• Chemical etching baths, household-acid substitutes, electro-etching, solvent grounds, improvised press machinery, and experiments on original heritage materials.

• CD shards, broken acrylic, sharp metal offcuts, mystery plastic, body-weight stabbing or forceful incisions.

• Chemical mordant recipes, etching bath concentrations/timings, heating, neutralization/disposal shortcuts, improvised driers, heat guns, and cranking pressure to rescue a faint print.

Cultural and source review

Specific specialist/practitioner review or permission is needed before claiming cultural endorsement or expanding into community-specific or restricted practice. No paid review, purchase, or spending is imposed as a blanket release gate for these explicitly labeled ordinary classroom adaptations. Do not claim any such consultation has occurred.