Bone carving collection maintenance method

Bone carvings are traditionally crafted from animal bones, such as those from cattle, camels, and even ivory (which is now prohibited). These items are made from organic materials and often feature intricate, detailed designs. Some pieces resemble flowers or other natural forms, showcasing the artistry of the craft. The craftsmanship emphasizes delicacy, translucency, and refinement—yet these materials are extremely fragile. They are vulnerable to breaking, cracking, or fading when exposed to physical impact, moisture, heat, or dry air. For this reason, proper care is essential for preserving bone carvings. In the opinion of Li Fangyuan, maintaining a bone carving collection requires consistent attention. Dusting, protecting from sunlight, keeping it waterproof, and preventing infestation by mites are all crucial steps in its preservation. First, the primary material used in bone carvings is calcium phosphate combined with organic matter. This composition makes them sensitive to temperature fluctuations, which can cause expansion, contraction, deformation, or even cracking. In winter, when the air is dry and temperatures vary greatly, special care is needed. Ideally, the storage environment should be maintained at a stable temperature between 15°C and 25°C. Additionally, exposure to light—especially ultraviolet rays—can lead to discoloration and embrittlement. Infrared and visible light can also raise the temperature, further damaging the piece. Therefore, bone carvings must be kept away from direct light sources. Second, bone carvings are highly sensitive to humidity. They naturally contain moisture and can absorb or release water depending on the surrounding conditions. This leads to expansion or contraction, potentially causing cracks or deformations. To prevent this, the ideal humidity level for storing bone carvings is between 55% and 60%. For larger pieces, using a glass cover with a small container of water inside can help maintain a stable humidity level. It’s also important to avoid placing these items in areas with high airflow, as this can accelerate drying and damage. Third, protection against pests like mites is essential. A small amount of anti-cavity agent can be placed in a sealed capsule near the collection. If dust accumulates, gently brush it off with a soft brush. If mildew appears due to improper care, it should be removed promptly. Professional cleaning involves washing with a diluted solution of citric or oxalic acid, followed by rinsing with distilled water and drying with a clean cloth. Finally, the piece should be allowed to dry slowly in a shaded area. Fourth, if a bone carving becomes cracked, it should not be washed. Instead, use a solution of white alcohol or trichloroethane with 1% soap to gently clean the surface. After the solution evaporates, wipe away any remaining soap with a solvent and reapply wax for polishing. If chemical cleaning isn’t available, there are simpler alternatives. For oil stains or stubborn dirt, use warm soapy water to gently scrub, but never soak the item. A toothbrush and toothpaste can also be used for light cleaning, but only for a short time and with immediate drying to prevent warping. Avoid using harsh chemicals like rubbing alcohol, as they can darken the surface and make it look dull. In general, older bone carvings don’t require frequent washing. Instead, they can be lightly waxed and then wiped with a fine white cloth to remove excess wax.

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