Scientific Protection Methods For Museum Cultural Relics, Guide To Temperature And Humidity Control In Exhibition Halls

The cultural relics in museums are precious links connecting the past and the present. Protecting these cultural relics means protecting the memory and civilization shared by mankind. This work is not just as simple as putting items in a showcase. It is a comprehensive undertaking that combines elements of science, management, and continuous investment. Only through rigorous, meticulous and professional methods can we ensure that these fragile historical witnesses can safely withstand the erosion of time and be passed on to future generations without any defects.

Why museum collections need scientific protection

Since collections were unearthed or collected and put into storage, they have entered different microenvironments. Fluctuations in temperature and humidity in warehouses, exhibition halls, temperature and humidity fluctuations during transportation, intensity of light, and even pollutants in the air will cause slow but irreversible damage to cultural relics. The primary task of scientific protection is to create a stable and suitable preservation environment for cultural relics.

For example, there is a piece of silk fabric that will fade quickly and become brittle under strong light; there is also a piece of wood with metal parts. In a humid environment, the metal will rust, swell, and eventually destroy the wood. Protection work is precisely based on in-depth exploration of the aging mechanism of these materials, and then formulating targeted preventive measures. This requires conservation personnel to not only understand history and art, but also be proficient in interdisciplinary knowledge such as materials chemistry and environmental science.

How to control temperature and humidity in museum exhibition halls

The core of preventive protection is temperature and humidity control. Most organic cultural relics such as paper, textiles, and leather, as well as some inorganic cultural relics such as certain metals, must be maintained in a relatively stable temperature and humidity range. Generally, the temperature is around 20°C and the relative humidity is 50% ± 5%. Large fluctuations are more serious than sustained adverse conditions, causing stress fatigue in materials due to repeated expansion and contraction.

Under normal circumstances, modern museums will use central air conditioning and constant humidity and temperature units, combined with the transformation of the building envelope, to achieve the required control of the overall environment. For those cultural relics that are particularly precious or extremely sensitive to the environment, micro-environment control technology in the display cabinets will be used, such as placing humidity-controlling materials and filling them with inert gas. During daily management, continuous observation and data recording are required so that problems can be detected and solved in time.

What damage will light cause to cultural relics?

Among the important factors that cause fading and aging of cultural relics is the presence of light, especially ultraviolet and strong visible light. The photon energy in the light will break the chemical bonds of the molecules of the cultural relic materials, thereby triggering a photo-oxidation reaction. Therefore, all museums have strict upper limits for the illumination of exhibition halls and warehouses. For example, the illumination of cultural relics that are particularly sensitive to light cannot exceed 50 lux.

The protective measures adopted include affixing anti-UV filters to the windows, selecting professional museum lighting sources, which should be UV-free or with low UV content, and the distance between the light source and the cultural relics and the exposure time should be strictly controlled. For items such as calligraphy, painting, and textiles, induction lighting is often used, or lighting methods are set up that visitors can manually turn on. This should not only meet the viewing needs, but also reduce the total dose of light radiation to the maximum extent.

How to prevent cultural relics from being damaged during transportation

The transportation of cultural relics is a very risky aspect of conservation work. As for shockproofing, that is the first aspect to consider. Each cultural relic has to be specially customized with inner packaging based on its own material, weight, center of gravity and fragile parts. Commonly used cushioning materials include acid-free tissue paper, polyethylene foam, special sponges, etc. These materials must firmly clamp the cultural relics to prevent any movement. At the same time, they must absorb and disperse the vibration energy transmitted from the outside world.

The outer packaging box is usually a solid wooden box or aluminum alloy box with a shock-absorbing system inside. The transport vehicle must be equipped with air bag suspension and constant temperature and humidity equipment. The entire transport route must be surveyed in advance to avoid bumpy roads. For important transports, escorts will be assigned to monitor the environment in the box in real time. Behind every successful off-site exhibition is a set of transport protection procedures as sophisticated as a surgical plan.

How to clean the surface of cultural relics in daily maintenance

The cleaning of cultural relics must be carried out in accordance with the principles of "minimum intervention" and "reversibility". It is not as simple as simple cleaning. First of all, we need to use various equipment such as microscopes and X-ray fluorescence spectrometers to analyze the composition of pollutants and the condition of the cultural relics themselves. Secondly, the cleaning method should start with the mildest physical method, such as gently brushing with a soft brush, or carefully removing it with a scalpel under a microscope.

For more stubborn stains, it may be necessary to use distilled water, alcohol and other solvents for local testing, and then use them after confirming that they are safe. The use of any chemical cleaner must be subject to strict experimental verification to ensure that it will not react with cultural relic materials and can be safely removed after treatment. The cleaning process should be well documented, and every material and method used should be reversible to leave room for future protection.

How to rescue cultural relics in sudden disasters

Situations such as fires, floods, and earthquakes are the most severe tests for museums. A functional emergency plan is extremely important. The plan should clearly define the evacuation route and list the cultural relics that should be prioritized for rescue. It should also determine the emergency gathering location and the responsibilities of the personnel in each position. Regular drills should be carried out in normal times to ensure that employees are familiar with the process.

When a disaster occurs, the first priority is to ensure the safety of personnel. If conditions permit, core collections must be transferred in accordance with the plan. For damaged cultural relics, preliminary stabilization treatment is carried out on site, such as providing temporary support to the water-soaked cultural relics to prevent them from collapsing, and then transferred to a temporary processing room as soon as possible. Subsequent rescue work is led by conservation experts, who perform cleaning, drying, reinforcement and other operations according to the type of damage. Each step needs to be carefully evaluated to avoid causing secondary damage.

Protecting the cultural relics in the museum is a silent race against time. It requires knowledge, patience, and a long-lasting sense of responsibility. Behind every treasure that can be passed down to the current world is the invisible contribution of countless conservation workers. When you visited a museum, have you ever paid special attention to the preservation status of a certain cultural relic, or were you curious about the details of a certain protection? You are welcome to share your observations and questions in the comment area. If you find this article helpful, please feel free to like and forward it so that more people can understand this work of protecting civilization.