Abstract:Stamp ink is a major product of gambier plant (Uncaria gambir) extracts. Its level of tannins is usually high, making it an ideal raw material in the production of dyes and stamp ink. Hence, it is necessary to identify these color forming components in stamp ink. The aim of this study was to identify the components, molecular structures, and the quality of gambier stamp ink complexed with FeSO4. Five samples of the ink were complexed with 30%, 25%, 20%, 15% and 10% FeSO4. The Gas Chromatography - Mass Spectrom… Show more
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