Prepared bast fibers into a small sheet

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

• A prepared-fiber candidate is documented, but no supplier has been verified for this exact safe long-strip lattice method. Obtain handling/provenance details and pilot the exact suitable material before scheduling; LAB-BP-02 remains fallback.

• Do not replace predicted outcomes with claims of tested success until an actual documented pilot.

• Record unknown botanical identity or wet-only mass honestly.

Teacher preparation

Procurement condition

Obtain professionally prepared, cooled, thoroughly washed long bast ribbons that can be arranged and joined by the specified method. Ask for botanical and local names, source, preparation and residual-processing information, handling guidance, and the dry-equivalent content of any wet batch. Verify geometry as well as the word “fiber.” Raw bark, a dried short-fiber pulp square, and ready-to-handle long strips are different products.

A manufacturer listing checked on 18 October 2026 provides a prepared-fiber lead: Carriage House Paper, Thai Kozo—Cooked & Bleached. It describes damp, cooked, cleaned, bleached fiber and gives a wet-to-dry package quantity. This establishes a prepared product lead, not long-strip geometry, final rinse chemistry, classroom suitability, or compatibility with the overlapping-ribbon method. Confirm those points with the supplier and test the actual batch before adopting it. No purchase or supplier consultation has been completed for this manuscript. Kōzo remains a named cross-cultural substitute, not evidence of ancient Mesoamerican material use.

If preparation or suitability cannot be established, use LAB-BP-02. Do not improvise a chemical cook. A pH strip alone cannot certify an unknown material as free of bleaching residues, dyes, allergens, or preservatives.

Class supply list, 24 students in 12 pairs

• 120 g dry-equivalent prepared long fiber: 72 g for twenty-four nominal 3 g student sheets and 48 g for pilots, patches, and contingencies
• Twenty-four smooth dedicated boards approximately 20 × 30 cm, with the exact surface tested for formation and release
• Six light, smooth wooden tapping tools and six non-slip mats for six simultaneous stations
• Twelve shallow trays, twelve small brushes, twelve sponges, and at least twenty-four absorbent cloths
• 3 L room-temperature working water, allocated at 250 mL per pair, plus separately recorded preparation/rinsing water
• School-approved eye protection for all people within the active zone, with fit and use determined by school policy
• Twelve ruler/pencil/label/notebook sets; one or two sieves and designated solid-fiber waste containers
• Drying capacity for twenty-four horizontal boards with air circulation
• One named contemporary teaching reference sheet or twelve approved offcuts, if available; inspection does not authorize destructive testing of a finished artwork

The dossier's 150–250 g tool mass range is a starting point for adult selection, not a certification. Avoid sharp stone tools, glass-bottle burnishers, and tools whose inertia makes controlled light taps difficult. Check boards and tools for cracks, splinters, unstable surfaces, and sharp edges.

Pilot and decision

Allow 60–90 minutes of active preparation/trial at least a week ahead, plus supplier-directed rehydration and full drying. Reserve at least four nominal 3 g portions. Record material identity, actual moisture basis, dimensions, board, tool, active time, added water, conditions, and failures. Trial release only after complete drying. Pilot the accessible pressing or rolling option separately; it may produce a different sample and should be described accordingly.

Proceed only when the actual batch spreads sufficiently, joins, dries, and releases with acceptable handling and safety. Do not coat boards with oil, wax, or household chemicals to rescue an unsuccessful setup. An unsuccessful pilot calls for the finished-sheet route, not greater striking force or student experimentation with residual chemistry.

If dry-equivalent content cannot be supplied, drain one homogeneous wet batch consistently and divide it by equal wet mass. Label it wet mass. Comparisons across batches with different hydration are not valid dry-fiber comparisons.

Timing and management

Period 1 allocates roughly 20 minutes to historical/material sources, 15 to safe handling and practice, and 15 to layout and records. Periods 2 and 3 each give six pairs a 30–35-minute formation block for two small sheets, followed by documentation and cleanup. Other students examine sources or observe from the designated safe position. Reserve 24–48 hours or more for drying; release remains conditional on dryness. Period 4 allocates 10 minutes to release/inspection, 15 to comparisons, 20 to arguments, and 5 to cleanup.

Maintain one operator per board, hand clearance, eye protection, light strokes, and a tool-rest area. Stop for stiff material, repeated lifting, splashing, odor, residue, discomfort, or tool damage. Do not store damp work in closed bags or improvise heaters, bleach, or preservatives. Follow school first-aid and incident procedures rather than chemical home remedies. Sieve solid fiber out of wash water and follow local disposal rules.

Assessment guidance

A nominally equal pair of sheets tests repeatability, not an isolated causal variable. An optional 2 g/4 g comparison needs a separately successful pilot and matched area, batch, tool, board, and working interval. Credit a precise account of a failed join or release. Deduct for a concealed repair or an unsupported claim that the class recovered an ancient recipe, not for roughness alone.

Schedule and equipment queues

Procurement gate: this dossier verifies no currently available supplier of the exact prepared long-strip material. Secure and pilot that material before promising this lab. If unavailable, use LAB-BP-02.

Class: 24 students in 12 pairs. Schedule four 50-minute periods, with at least one overnight drying interval between formation and evaluation. Allow additional time if stations rotate slowly. Teacher preparation requires a pilot at least one week ahead, approximately 60–90 minutes of active setup and trial, plus whatever rehydration and drying time the supplied material requires. Real classroom timing is an observation to record.

Suggested schedule:

• Period 1: sources and cultural/material distinctions, 20 minutes; safe tool demonstration and station practice without production, 15; layout planning, labels, and evidence sheets, 15.
• Period 2: first six pairs form two samples each, 30–35 minutes including setup; other pairs work on source cards and observe. Allow 5–10 minutes for documentation and cleanup.
• Period 3: second six pairs form samples using the same 30–35-minute allocation; other pairs finish source comparisons and diagram planning. Clean up and place boards on the drying rack.
• Overnight or longer: leave on the tested drying surface until completely dry. Reserve 24–48 hours in the plan, but do not remove a damp sheet because a timer expired.
• Period 4: release and inspect, 10 minutes; material tests, 15; comparisons and written argument, 20; cleanup, 5.

A 20-minute formation block would be optimistic for two beginner sheets. The pilot should establish the actual time needed; shorten the number of sheets rather than compressing safe handling.

Alternative material plans

Use the accessible alternatives and fallback instructions in the student procedure.

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

• Review fiber, latex, art-material, and adhesive sensitivities; provide a no-contact observation role or equivalent paper-based activity.

• Use potable, room-temperature water. No food or drink in work areas; wash hands afterward.

• A teacher checks tools and boards for cracks, splinters, sharp edges, and instability.

• Use school-approved eye protection during tapping; keep fingers outside the striking area. One operator per board. Place the tool down before rearranging fiber.

• Light wooden tapping tools replace handheld volcanic stones. Short controlled strokes are required; no overhead swinging. If repeated impacts or noise cannot be supervised, use the finished-sheet route.

• Provide seating, rests, a pressing/rolling alternative, and non-percussion tasks. A mobility or sensory accommodation is not an inferior version of the lesson.

• Keep floors dry. Collect solid fiber in a sieve; do not wash it into drains. Follow local school disposal requirements for art materials.

• Prepare wet fiber promptly and dry sheets thoroughly. Do not store damp work sealed in bags; discard suspect moldy material under school procedures. Do not add bleach or preservatives to rescue it.

• Any unexpected residue, strong odor, skin/eye discomfort, or tool damage is a stop condition. Use school first-aid and incident procedures; do not improvise chemical remedies.

Stop when

• Unknown preparation or residual chemistry: reject batch for students and use LAB-BP-02.

• Stiff fiber, repeated tool lifting, splashing, unstable tools, damaged board, strong odor, discoloration, suspected mold, or skin/eye discomfort: stop and use school procedures.

• Resistance during dry release: stop; no yanking, knives, or unplanned soaking.

• Unmanageable noise, fatigue, supervision, or unsafe impacts: stop percussion and use an accessible alternative.

Trained adult only

• Trained supplier or papermaker performs all hot/chemical fiber preparation off-site under an established procedure.

• Teacher verifies supplier handling information, school suitability, actual board/tool pilot, setup and disposal.

• Adult tests a completely dry sheet edge before student release.

Excluded activities

• Student bark cooking or harvesting; limewater, caustic soda, ash lye, bleach, hot vats, open fire, raw plant latex, loose mineral pigment, sharp stone tools and glass burnishers.

• Improvised neutralization, stronger blows to compensate for wrong fiber, household board coatings, improvised heaters, and bleach/preservative rescue of mold.

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.