Abstract
Fourteen heavily damaged postage stamps were chosen for an infrared and scanning electron microscopy (SEM) characterization of their non-printed margins. The results show the presence of kaolinite used as filler in all but two samples. These last two contain aluminum (with an Al-OH moiety). One stamp seems to contain barium in the form of sulfate. One stamp contains lead in an unknown chemical compound. All these results were incorporated into a database for future analysis. Quantum chemical calculations of diverse large models of cellulose seem absolutely necessary for the IR band assignments.
- archeology,
- cellulose,
- dqcauchile
- electron
- ft-ir
- infrared
- kaolinite,
- microscopy,
- paper
- philately,
- pigments,
- postage
- raman
- scanning
- sem,
- spectra,
- spectroscopy,
- stamps,
- xrf,
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