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Use the Material_Technique field to record what materials were used to make the work. In our Luna database we treat this field as a free text field where a list of materials and their relationship to each other are represented in a single phrase. Take this information from the image source or other reputable sources that you come across while cataloging the work. Do not use the 'Material_Technique refid source' or 'Material_Technique refid' fields.
Material_Technique: 4 photographs on transparent film, 4 light boxes, and black rubber
Material_Technique: wood chair hung on wall with board across seat, coffee pot, tumbler, china, egg cups, eggshells, cigarette butts, spoons, tin cans, etc.
Material_Technique: oil on canvas