Water swollen, rigid, 3-dimensional network of cross-linked, hydrophilic macromolecules, 20-95% water. They are used in paints, printinginks, foodstuffs, pharmaceuticals, and cosmetics. (Grant & Hackh's Chemical Dictionary, 5th ed)
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Dr. Amir, Doctor
Master of Internal medicine & Gastroenterology with six years of experience (London). MBBS
