Table 4: Results of complete analyses performed on commercial black ballpoint pen ink extractions. Two or three thin-layer chromatography spots were observed for Crystal Violet (Methyl Violet) because of the presence of demethylation products
Table 4: Results of complete analyses performed on commercial black ballpoint pen ink extractions. Two or three thin-layer chromatography spots were observed for Crystal Violet (Methyl Violet) because of the presence of demethylation products.
|
Ink |
TLC (Dye Color) |
CE Results (μep [cm2/V·s]; Identity) |
UV-Vis Similarity |
MALDI Mass Ions (m/z) |
|
1 |
2 Purple Pink Yellow |
+0.875 x 10–4 ; Crystal Violet 0.00-EOF marker; Rhodamine Base B –1.516 x 10–4 ; Metanil Yellow |
96.6% N/A 88.2% |
+372.80 N/A –352.75 |
|
2 |
Blue 3 Purple |
–5.126 x 10–4 ; unidentified dye – see text +0.645 x 10–4 ; Methyl Violet |
N/A 99.2% |
N/A N/A |
|
3 |
Blue 3 Purple |
Unidentified dye – see text Unidentified dyes – see text |
N/A N/A |
N/A |
|
4 |
3 Purple |
+0.812 x 10–4 ; Methyl Violet |
98.6% |
+358.33, +372.80 |
|
5 |
Blue 3 Purple |
–2.649 x 10–4 ; Erioglaucine +0.747 x 10–4 ; Methyl Violet |
92.0% 98.7% |
N/A N/A |
|
6 |
2 Purple Yellow |
+0.732 x 10–4 ; Crystal Violet –1.518 x 10–4 ; Metanil Yellow |
99.3% 97.3% |
+372.58 –352.27 |
|
7 |
3 Purple 1 Purple Yellow |
+0.786 x 10–4 ; Methyl Violet –3.660 x 10–4 ; unidentified dye – see text –3.305 x 10–4 ; Acid Yellow 42 |
98.7% N/A 98.2% |
+358.31, +372.14 N/A N/A |
|
8 |
3 Purple |
+0.826 x 10–4 ; Methyl Violet |
97.9% |
+358.75, +372.86 |
|
9 |
3 Purple |
+0.828 x 10–4 ; Methyl Violet |
98.3% |
+358.70, +372.86 |
|
10 |
3 Purple |
+0.842 x 10–4 ; Methyl Violet |
99.0% |
N/A |
|
11 |
2 Purple Yellow |
+0.343 x 10–4 ; Methyl Violet –1.560 x 10–4 ; Metanil Yellow |
99.0% 97.9% |
+370.04 –351.55 |
|
12 |
3 Purple Yellow |
+0.353 x 10–4 ; Methyl Violet –3.189 x 10–4 ; Acid Yellow 42 |
99.1% 99.4% |
+372.37, +358.08 N/A |
|
13 |
Yellow 2 Purple |
Unidentified dye – see text Unidentified dyes – see text |
N/A N/A |
N/A |
|
14 |
3 Purple 1 Purple |
+0.756 x 10–4; Methyl Violet –4.926 x 10–4; unidentified dye – see text |
99.2% N/A |
+372.56, +358.52 N/A |
|
15 |
Blue 2 Purple Yellow |
FAST compound – see text +0.827 x 10–4; Crystal Violet –1.519 x 10–4; Metanil Yellow |
N/A 97.4% 97.3% |
N/A +375.78, +359.00 –351.64 |