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| | AllRefer.com - gum, colloidal plant substance (Organic Chemistry) - Encyclopedia |
 | | In this classification, however, many substances that are not true gums are included, among them many resins, so-called gum resins, and such substances as frankincense, myrrh, labdanum, copal, amber, chicle, and rubber (gum elastic, India rubber). |
 | | True gums are complex organic substances mostly obtained from plants, some of which are soluble in water and others of which, although insoluble in water, swell up by absorbing large quantities of it. |
 | | In general, they contain in various proportions carbon, hydrogen, oxygen, and such metals as calcium, magnesium, and potassium in the form of salts of various organic acids. |
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