Preserve Materials

Preserve and conserve library and archival materials through environmental control, proper handling, repair techniques, and disaster preparedness.

适用场景

• You are establishing preservation practices for a new or existing collection
• Materials show signs of deterioration (foxing, brittleness, loose bindings)
• You need to set up environmental controls for a storage or display area
• You are planning digitization to preserve fragile originals
• You need a disaster recovery plan for a library or archive

输入

• 必需: Materials to preserve (books, manuscripts, photographs, maps, media)
• 必需: Current storage conditions (temperature, humidity, light exposure)
• 可选: Budget for preservation supplies and equipment
• 可选: Digitization equipment (scanner, camera, software)
• 可选: Condition survey of existing collection

步骤

第 1 步：Assess Current Conditions

Survey the environment and the materials to establish a baseline.

Environmental Assessment Checklist:
+-----------------------+------------------+---------------------+
| Factor                | Ideal Range      | Measure With        |
+-----------------------+------------------+---------------------+
| Temperature           | 18-21°C          | Thermometer with    |
|                       | (65-70°F)        | min/max recording   |
+-----------------------+------------------+---------------------+
| Relative Humidity     | 30-50% RH        | Hygrometer or       |
|                       |                  | datalogger          |
+-----------------------+------------------+---------------------+
| Light (storage)       | <50 lux          | Light meter         |
|                       | No UV            |                     |
+-----------------------+------------------+---------------------+
| Light (display)       | <200 lux         | Light meter +       |
|                       | UV filtered      | UV filter readings  |
+-----------------------+------------------+---------------------+
| Air quality           | Low dust, no     | Visual inspection,  |
|                       | pollutants       | HVAC filter check   |
+-----------------------+------------------+---------------------+

Material Condition Survey (sample 10% of collection):
- Excellent: No visible damage, binding intact, pages flexible
- Good: Minor wear, slight yellowing, binding sound
- Fair: Moderate foxing, some loose pages, spine cracked
- Poor: Brittle pages, detached covers, active mold or pest damage
- Critical: Pages fragmenting, structural failure, immediate intervention needed

Record the percentage in each condition category.

预期结果： Baseline data for environmental conditions and material health, identifying immediate risks and long-term trends.

失败处理： If monitoring equipment is unavailable, use a basic thermometer/hygrometer from a hardware store. Imprecise data is far better than no data. Prioritize humidity monitoring — it is the single most damaging environmental factor.

第 2 步：Establish Environmental Controls

Create and maintain the conditions that slow deterioration.

Environmental Control Priorities (in order of impact):

1. HUMIDITY CONTROL (most critical)
   - Target: 30-50% RH, with <5% daily fluctuation
   - Too high (>60%): mold growth, foxing, warping
   - Too low (<25%): brittleness, cracking, flaking
   - Solutions: dehumidifier, humidifier, HVAC control, silica gel
   - Monitor continuously with datalogger

2. TEMPERATURE CONTROL
   - Target: 18-21°C (65-70°F), with <3°C daily fluctuation
   - Lower is better for long-term preservation (slows chemical decay)
   - Stability matters more than exact temperature
   - Never store near exterior walls, heating vents, or pipes

3. LIGHT MANAGEMENT
   - UV radiation causes irreversible fading and embrittlement
   - Filter all windows with UV film (blocks >99% UV)
   - Use LED lighting (no UV emission) instead of fluorescent
   - Keep lights off in storage areas when not in use
   - Display items on rotation (3-6 months on, then rest)

4. AIR QUALITY
   - HVAC filters: minimum MERV 8, ideally MERV 13
   - No food or drink near materials
   - Avoid off-gassing materials (fresh paint, new carpet, cardboard)
   - Ensure air circulation to prevent microclimate pockets

5. PEST MANAGEMENT (IPM)
   - Inspect incoming materials before shelving
   - Sticky traps at floor level, checked monthly
   - No cardboard boxes (pest habitat) — use archival containers
   - If pests found: isolate affected items, freeze treatment
     (-20°C for 72 hours kills most book pests)

预期结果： Environmental conditions within target ranges, monitored continuously, with documented response procedures for excursions.

失败处理： If HVAC is not controllable (rental space, historic building), focus on microenvironments: archival boxes, silica gel packets, and sealed display cases create local climate control even when the room cannot be managed.

第 3 步：Handle Materials Properly

Prevent damage from the most common source: human handling.

Handling Rules:
1. Clean, dry hands — no gloves for paper (reduces grip and
   dexterity; gloves are for photographs and metal objects)
2. Support the spine: never pull a book by the headcap
   - Push neighboring books back, then grip the desired book
     by both boards at the middle of the spine
3. Never force a book open past its natural opening angle
4. Use book cradles or foam wedges for fragile bindings
5. Pencils only near materials — never pen or ink
6. Flatwork (maps, prints): handle with two hands, support
   full sheet, never fold or roll unless already in that format
7. Photographs: handle by edges only, cotton gloves required
8. Transport: use book trucks with padded shelves, never stack
   more than 3 volumes, never carry more than you can control

Shelving Rules:
- Books upright, snug but not tight
- Oversize volumes flat (never leaning at an angle)
- No bookends that press into the text block
- Pamphlets in acid-free pamphlet binders, not loose on shelves

预期结果： All users and staff follow handling procedures. No new damage from routine use.

失败处理： If damage occurs from handling, repair promptly (Step 4) and retrain the person involved. Most handling damage is cumulative — a single instance of pulling by the headcap won't destroy a book, but doing it daily will.

第 4 步：Repair Damaged Materials

Perform conservation treatments matched to the damage level.

Repair Triage Matrix:
+---------------------+---------------------+----------------------------+
| Damage              | Severity            | Treatment                  |
+---------------------+---------------------+----------------------------+
| Torn page           | Minor               | Japanese tissue + wheat    |
|                     |                     | starch paste (reversible)  |
+---------------------+---------------------+----------------------------+
| Loose page          | Minor               | Tip-in with PVA adhesive   |
|                     |                     | along inner margin         |
+---------------------+---------------------+----------------------------+
| Detached cover      | Moderate            | Recase: new endsheets,     |
|                     |                     | reattach cover boards      |
+---------------------+---------------------+----------------------------+
| Cracked spine       | Moderate            | Spine repair with airplane |
|                     |                     | linen and adhesive         |
+---------------------+---------------------+----------------------------+
| Foxing (brown spots)| Cosmetic            | Do NOT bleach. Reduce      |
|                     |                     | humidity to prevent spread  |
+---------------------+---------------------+----------------------------+
| Brittle pages       | Severe              | Deacidification spray      |
|                     |                     | (Bookkeeper or Wei T'o)    |
+---------------------+---------------------+----------------------------+
| Mold (active)       | Critical            | Isolate immediately.       |
|                     |                     | Dry in moving air. Brush   |
|                     |                     | off when dry. HEPA vacuum. |
+---------------------+---------------------+----------------------------+
| Water damage        | Critical/Emergency  | Air dry within 48 hours    |
|                     |                     | or freeze for later drying |
+---------------------+---------------------+----------------------------+

Conservation Principles:
1. REVERSIBILITY: Any treatment should be undoable without
   damaging the original (use wheat starch paste, not superglue)
2. MINIMAL INTERVENTION: Do the least necessary to stabilize.
   Not every old book needs to look new
3. DOCUMENTATION: Photograph before and after. Record materials
   and methods used in the catalog record
4. KNOW YOUR LIMITS: Complex repairs (rebinding, leaf casting,
   leather treatment) require trained conservators

Essential Repair Supplies:
- Japanese tissue (various weights: 3-12 gsm)
- Wheat starch paste (cook fresh or use premixed)
- PVA adhesive (pH-neutral, archival grade)
- Bone folder
- Microspatula
- Waxed paper (for interleaving during drying)
- Book press or weights

预期结果： Damaged items stabilized using reversible treatments, with documentation in the catalog record.

失败处理： If a repair exceeds your skill level, stabilize the item (wrap in acid-free tissue, place in a protective box) and flag it for professional conservation. A bad repair is worse than no repair.

第 5 步：Store in Archival Materials

Replace harmful storage materials with acid-free alternatives.

Storage Material Standards:
+-------------------+---------------------------+---------------------------+
| Material          | Avoid                     | Use Instead               |
+-------------------+---------------------------+---------------------------+
| Boxes             | Corrugated cardboard      | Acid-free/lignin-free     |
|                   | (acidic, attracts pests)  | document boxes            |
+-------------------+---------------------------+---------------------------+
| Folders           | Manila folders (acidic)    | Acid-free folders         |
+-------------------+---------------------------+---------------------------+
| Tissue            | Regular tissue paper      | Acid-free, unbuffered     |
|                   |                           | tissue (for photos too)   |
+-------------------+---------------------------+---------------------------+
| Sleeves           | PVC plastic (off-gasses)  | Polyester (Mylar),        |
|                   |                           | polypropylene, or         |
|                   |                           | polyethylene              |
+-------------------+---------------------------+---------------------------+
| Envelopes         | Glassine (not all         | Acid-free paper or        |
|                   | archival grade)           | Tyvek envelopes           |
+-------------------+---------------------------+---------------------------+
| Labels/tape       | Pressure-sensitive tape,  | Linen tape (water-        |
|                   | rubber bands, paper clips | activated), cotton ties   |
+-------------------+---------------------------+---------------------------+

Special Format Storage:
- Photographs: individual sleeves, upright in acid-free boxes
- Newspapers: unfold, interleave with acid-free tissue, flat storage
- Maps/large prints: flat in map cabinets or rolled (face out) on
  acid-free tubes (minimum 4" diameter)
- Audio/video media: upright, in jewel cases, cool and dry

预期结果： All materials housed in appropriate archival-quality containers, free from acidic or harmful enclosures.

失败处理： If archival supplies are beyond budget, prioritize the most valuable and fragile items first. Even placing acid-free tissue between a book and a cardboard box significantly slows acid migration.

第 6 步：Plan for Disasters

Prepare a response plan for water, fire, mold, and other emergencies.

Disaster Preparedness Essentials:

1. PRIORITY LIST: Rank items for salvage priority (1-3)
   - Priority 1: Unique, irreplaceable items (manuscripts, archives)
   - Priority 2: Rare or expensive items
   - Priority 3: Replaceable items

2. EMERGENCY SUPPLIES KIT (pre-positioned):
   - Plastic sheeting and tarps
   - Mops, buckets, sponges
   - Fans (for air drying)
   - Freezer paper and plastic bags (for freeze-drying)
   - Flashlights and batteries
   - Contact list: conservators, freeze-drying services, insurers

3. WATER EMERGENCY PROTOCOL (most common disaster):
   - Stop the water source if possible
   - Remove materials from standing water immediately
   - Separate wet items: do not stack
   - Air dry paper materials within 48 hours (mold starts at 48 hrs)
   - If too many items to dry in 48 hours: freeze them
     (-20°C stops mold, preserves for later vacuum freeze-drying)
   - Interleave wet pages with absorbent paper, change regularly
   - Never use heat to dry (causes warping and cockling)

4. DOCUMENTATION: Photograph damage for insurance before cleaning.
   Record all affected items and their condition.

预期结果： A written disaster plan, pre-positioned supplies, and a trained response team (even if the "team" is one person).

失败处理： If a disaster occurs without a plan, the 48-hour rule for water damage is the critical knowledge: get wet materials air-drying or frozen within 48 hours. Everything else can wait.

验证清单

• Environmental baseline established (temperature, humidity, light)
• Monitoring in place (continuous datalogger or daily readings)
• Handling procedures documented and followed
• Damaged items triaged and repaired or stabilized
• Harmful storage materials replaced with acid-free alternatives
• Disaster plan written with priority list and emergency contacts
• High-value or fragile items prioritized for preservation attention

常见问题

• Humidity neglect: Temperature gets all the attention, but humidity is the primary driver of mold, foxing, warping, and pest infestations. Monitor humidity first
• Irreversible repairs: Superglue, pressure-sensitive tape, and rubber cement permanently damage paper. Always use reversible adhesives (wheat starch paste, PVA)
• Over-handling during preservation: Ironically, zealous preservation efforts can cause more handling damage than benign neglect. Sometimes the best preservation is leaving an item undisturbed in a good environment
• Treating foxing aggressively: Bleaching removes foxing spots but weakens paper fibers. Accept cosmetic imperfections unless they threaten legibility
• No disaster plan: Most libraries that lose collections to water damage had no plan and no pre-positioned supplies. The plan costs nothing; the loss costs everything

相关技能

• catalog-collection

  — Catalog records should note preservation actions and condition

• curate-collection

  — Weeding decisions consider item condition alongside use

• maintain-hand-tools

  — Tool care principles (clean, oil, store properly) parallel material care