![]() ![]() ![]() Paint and varnish surfaces can also blanch. Ground and paint layers can swell in the presence of water and then separate from the underlying canvas. Wooden stretchers will also swell and may warp, possibly causing distortions and tears in the canvas. The layers of laminated cards can separate and distort. Canvas supports can shrink dramatically when wet, causing paint and ground layers to crack, buckle and flake off. The most significant risks are the expansion, shrinkage and subsequent deformation of painting supports, as well as flaking and loss of image layers.Ĭommonly used painting supports that react to moisture include canvas, wood, hardboard and laminated card. Organization and planning are essential to effectively recover collections. It is therefore important to be prepared with supplies and a plan of action that includes personnel contact numbers, roles and responsibilities a current list of suppliers and sources of disaster-recovery equipment. Considering the devastating effect water has on a collection of paintings, it is wise to take all measures to prevent an occurrence from happening or to reduce its effects. We strongly recommend putting an emergency preparedness policy and disaster plan in place before an emergency or disaster occurs (see CCI Notes 14/1 Emergency Preparedness for Cultural Institutions: Introduction and 14/2 Emergency Preparedness for Cultural Institutions: Identifying and Reducing Hazards). The information provided can also be used to help prepare an emergency response plan tailored to your institution's collection. The steps below, summarized in a condensed plan of action at the end of this Note, can be followed in an emergency situation. This Note describes actions that can reduce the immediate effects of water damage. However, if expert assistance is not available, non-conservators can carry out the specific emergency procedures outlined here. Because water-damaged paintings are likely to be in an extremely vulnerable state, contact a conservator as soon as possible. Thus, it is important to deal with water-affected paintings through immediate controlled drying. Simple air drying may not be suitable for most wet paintings because layers will react at different rates, and paint flaking and loss are likely. The effects of water contact may not occur immediately but may take minutes to hours to develop. Because, for most paintings, exposure to water may immediately cause damage as well as predispose the artwork to short or long-term damage, every possible precaution should be taken to eliminate this risk. It is usually the result of leaking or burst water pipes, flooding, sewer back-ups or efforts to extinguish a fire. Water can cause serious damage to a collection of paintings. It can be copied and posted in an accessible location to use during an emergency. Survey the affected area to assess the situation and ensure personal safety, and undertake procedures to prevent further damage.Ī condensed plan of action has been provided in an Appendix to this Note. These appear lighter and less crisp, but can give a great atmospheric quality.In the event of an emergency, call a conservator as soon as possible. Although it isn't as popular, you can also use watercolors on canvas.Oils are toxic and have a smell, due to the use of turpentine to thin the colors. It will yellow over time as the oil oxidizes. The color of the paint remains the same when it dries. The oil can degrade the linen or cotton fabric of the canvas. They blend well and make easy transitions between colors. The extra drying time makes it harder to make crisp lines. Oil paints allow longer working times because they take longer to dry.Acrylics also come off brushes with water. They are also non toxic and have no smell. You can use super thin or thick layers because the paint will dry all the way through. They don't change color over time, but they appear darker when they dry on the canvas. You can get a defined edge, but color blending is hard. It can be difficult when you are mixing paint and painting on large surfaces. This can help if you want to do many layers or apply crisp lines. You should weigh the pros and cons of each and decide which is best for your project. The one you choose depends on what you want to paint and the way in which you want to paint it. There are two major types of paint used on canvas, oil and acrylic. ![]()
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