A modified natural resin made from rosin that has been esterified by heating with a polyhydric alcohol, such as glycerol. Ester gum contains the glyceryl, methyl, and ethyl esters of rosin acids. Ester gum is lighter in color than rosin and have a higher softening point but lower acid number. It is not used in artist paints or varnishes although they have been tried for wax-resin linings. It is used instead of copal, dammar, or kauri in making enamels, paints, nitrocellulose lacquers, and tung oil mixtures.
藝術與建築詞典根目錄 
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材料層面
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材料 (材料層面)
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材料
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<依成分區分之材料>
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有機材料
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樹脂
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酯膠
[酯膠 ester gum(編號300012953)]。《藝術與建築索引典》。http://aat.teldap.tw/AATFullDisplay/300012953(2025/04/05瀏覽)。