Storage Methods for Wooden Objects in Polish Ethnographic Collections

Storage as Preventive Conservation

The majority of objects in Polish ethnographic collections are held in storage rather than on display at any given time. Storage conditions — including shelving configuration, packaging, orientation, light exposure, and accessibility — directly affect the rate of physical deterioration. Preventive conservation literature consistently identifies inadequate storage as a primary cause of avoidable damage to collection objects, outweighing both active conservation treatment interventions and display-related risks in terms of cumulative impact on collections.

Polish state museums follow guidance from NIMOZ (Narodowy Instytut Muzealnictwa i Ochrony Zbiorów) on collections management and storage standards, which incorporate international frameworks including ISO 11799 (document storage), PAS 198 (environmental specifications), and ICOM-CC preventive conservation recommendations adapted for the Polish institutional context.

Depot Typology in Polish Institutions

Polish museum depots range from purpose-built climate-controlled facilities at major national institutions (such as the Muzeum Narodowe w Krakowie's depot complex at Nowa Huta) to adapted spaces in historic buildings where environmental control is partial or limited. The storage approach for wooden objects must be calibrated to the actual conditions achievable in a given facility.

Open-air museums (skansenы) — of which Poland has a significant number, including the Muzeum Wsi Mazowieckiej w Sierpcu and the Muzeum Budownictwa Ludowego w Sanoku — present a distinct case: many of the wooden structures and objects in these collections are exposed to outdoor conditions as part of their function. Conservation practice at these institutions focuses on periodic treatment, protective coatings, and structural maintenance rather than depot storage.

Shelving and Racking Systems

Wooden objects in depot storage are generally placed on metal shelving systems (powder-coated steel, sometimes with padded surfaces) rather than timber shelves, to avoid acetic acid off-gassing from wooden shelving materials. Larger objects — furniture, agricultural implements, architectural elements — may be stored on padded pallets or in custom-built mobile racking. Heavy items are never stored directly on the floor; a minimum clearance of 10–15 cm is maintained to allow inspection and air circulation.

Freestanding carved figures and sculptures are typically supported by custom cradles, fabricated from Ethafoam or Plastazote lined with Tyvek or cotton batting, shaped to distribute the object's weight without concentrating stress on fragile projections. The cradle dimensions are recorded in the object's storage documentation.

Packaging Materials

Appropriate packaging for wooden ethnographic objects in Polish collections typically involves the following material hierarchy:

• Direct contact materials: acid-free tissue (unbuffered for objects with protein-based or certain organic binders), Tyvek sheeting, or washed unbleached cotton. Synthetic foam (Ethafoam, Plastazote) is used as a support layer but is not recommended in direct contact with polychrome surfaces.
• Intermediate packaging: acid-free board boxes or corrugated archival boxes for small and medium objects. Lids are secured with cotton ties or acid-free tape — not rubber bands or adhesive plastic tapes.
• Outer packaging: for transport or long-term storage, objects may be enclosed in custom wooden crates lined with Ethafoam. The crate interior is designed to prevent movement during transport through close-fitting foam support.

Silica gel is used in enclosed packaging to buffer humidity around objects stored in areas where depot RH control is inadequate. Conditioning of silica gel to the target RH before placement is standard practice, and gel is recharged or replaced on a schedule determined by monitoring of the micro-environment inside the packaging.

Orientation and Load Considerations

The orientation in which a wooden object is stored matters significantly for long-term preservation. Objects with thin sections — carved spoons, decorated boards, woven tool components — should be stored flat rather than upright to avoid gravity-induced deformation. Furniture is often stored in its functional orientation (upright) to avoid redistributing stress to structural joints not designed for inverted or horizontal loading.

Stacking of objects is generally avoided unless custom support structures ensure that no object bears the load of another. Even light objects placed on top of polychrome wooden surfaces can cause localised pressure damage to raised decoration.

Labelling and Access

Objects in Polish museum depots are identified by accession numbers linked to the collection database. Physical labels attached to objects use archival paper with pencil, Indian ink, or tying labels in cotton; adhesive labels in direct contact with wooden surfaces are avoided due to the risk of staining and adhesive residue. Storage locations are recorded in the collection management system, allowing retrieval without unnecessary handling of intervening objects.

Access protocols require that objects are handled with clean cotton gloves or, for fragile polychrome surfaces, clean bare hands (which provide better sensitivity and control). Photographs or diagrams indicating safe handling points are attached to storage records for objects with specific fragility concerns.

Periodic Inspection

Stored wooden objects should be inspected periodically for signs of new pest activity, active structural movement, or changes in the condition of polychrome layers. The inspection frequency varies by institution and object risk profile; a minimum annual inspection is typical for objects in climate-controlled storage, with more frequent checks for objects in areas of lower environmental stability.

Newly acquired objects, objects returned from loan, and objects removed from display are quarantined in a separate holding area before being placed in the main depot. Quarantine allows inspection for active insect infestation and assessment of whether treatment is needed before the object enters the general collection storage environment.

External References

• NIMOZ — Storage Standards for Museum Collections
• ICOM-CC — Preventive Conservation
• AIC Conservation Wiki — Preventive Conservation
• Muzeum Wsi Mazowieckiej w Sierpcu