T HE STUDY of aging of valuable documents is asked by the Forensic Medicine in Egypt. Eight ballpoint pens; commonly used in Egypt were chosen for this study. The aging was studied kinetically by measuring the solvent concentration of 2-phenoxyethanol overtime by the GC-MS. The ink aging curves were plotted, using the solvent volatility ratio was an effective method of determining the chronological age of the ballpoint pen inks. Our technique was demonstrated by examining two printed forms of the trust receipts. It was found that determining the ink date is valid and can be trusted. A simple equation that can be applied for the prediction of ink dating was proposed.

N ON-reactive polyamides were prepared by reacting Soy-based dimer fatty acids and, two different diamines (ethylenediamine and isophornedimine). Soy-based dimer fatty acids used was of dimer/trimer/ Monomer mixtures, ≥80/ ≤18/ ≤5. The number average molecular weight of polyamide (Mn) ranged from 2479-2803, weight average molecular weight (Mwt) from 6761-10220, Z weight average molecular weight (Mz) from 13532-26876, maximum peak (Mp) from 5555-7448 and the most fundamental characteristic of a polymer its molecular weight distribution(PDI) degree of polymerization ranged from 2.727-3.713, the melting point (Tm) 106.477, the glass transition (Tg) was 76.46-98.9°C, the viscosity of 35% solution in butanol / toluene 1:1,v/v, 85-128 s at 25°C (Ford Cup No. 4) , the Softing point was 114-123°C. and Evaluation gloss and color strength polyamides in ink on films (paper, polyethylene milk, and polyvinylchloride). Most of these polyamides have properties comparable to the commercially available polyamides used in flexographic inks.