Experiments:
* Thin-layer chromatography (TLC): Separate the components of the ink solution based on their polarity and identify the solvent spot. Use different solvent systems to optimize the separation.
* Solvent extraction: Use a solvent immiscible with the ink solution (e.g., dichloromethane) to extract the solvent from the ink. Vary the solvent ratio and extraction time to optimize the extraction efficiency.
* Distillation: If the solvent has a lower boiling point than the other ink components, distill the mixture to separate and collect the solvent.
Analysis:
* Gas chromatography-mass spectrometry (GC-MS): Identify and quantify the extracted solvent and other volatile components in the ink solution.
* UV-Vis spectroscopy: Measure the absorbance of the extracted solvent at different wavelengths to determine its concentration and purity.
* Fourier-transform infrared (FTIR) spectroscopy: Identify functional groups present in the extracted solvent and confirm its identity.
* Nuclear magnetic resonance (NMR) spectroscopy: Determine the structure and molecular composition of the extracted solvent.