Table 4.
Colorimetric reaction of each substance with each reagent and number of samples in which the substance was identified by the colorimetric test and GC/MS.
| Substance | Colorimetric reagent | |||||
|---|---|---|---|---|---|---|
| Lieberman | Mandelin | Marquis | Mecke | Scott | Hoffmann | |
| Ketamine | ||||||
| Color reaction | Light yellow | Orange-Red | No reaction | No reaction | No reaction | No reaction |
| No. samples positive at CT | 25 | 25 | ||||
| No. samples confirmed at GC/MS | 32 | 32 | ||||
| Proportion 0.78 S.E 0.073 95% C.I 0.60 ± 0.91 |
Proportion 0.78S.E 0.07395% C.I 0.60 ± 0.91 | |||||
| MDMA | ||||||
| Color reaction | Brown-Black | Blue-Black | Violet-Black | Green-Black | No reaction | No reaction |
| No. samples positive at CT | 33 | 33 | 33 | 33 | ||
| No. samples confirmed at GC/MS | 28 | 28 | 28 | 28 | ||
| Proportion 0.84 S.E 0.062 95% C.I 0.68 ± 0.94 |
Proportion 0.84 S.E 0.06295% C.I 0.68 ± 0.94 |
Proportion 0.84 S.E 0.062 95% C.I 0.68 ± 0.94 |
Proportion 0.84S.E 0.06295% C.I 0.68 ± 0.94 | |||
| Amphetamine | ||||||
| Color reaction | Orange | Green | Orange | No reaction | No reaction | No reaction |
| No. samples positive at CT | 10 | 10 | 10 | |||
| No. samples confirmed at GC/MS | 11 | 11 | 11 | |||
| Proportion 0.91 S.E 0.087 95% C.I 0.59 ± 1.0 |
Proportion 0.91S.E 0.08795% C.I 0.59 ± 1.0 | Proportion 0.91 S.E 0.087 95% C.I 0.59 ± 1.0 |
||||
| Cocaine | ||||||
| Color reaction | Light orange | No reaction | No reaction | No reaction | Blue | No reaction |
| No. samples positive at CT | 11 | 11 | ||||
| No. samples confirmed at GC/MS | 12 | 12 | ||||
| Proportion 0.92 S.E 0.080 95% C.I 0.62 ± 1.0 |
Proportion 0.92 S.E 0.080 95% C.I 0.62 ± 1. |
|||||
| Heroin | ||||||
| Color reaction | Black | Green-Brown | Violet | Green | No reaction | No reaction |
| No. samples positive at CT | 8 | 8 | 8 | 8 | ||
| No. samples confirmed at GC/MS | 7 | 7 | 7 | 7 | ||
| Proportion 0.88 S.E 0.12 95% C.I 0.47 ± 1.0 |
Proportion 0.88S.E 0.1295% C.I 0.47 ± 1.0 | Proportion 0.88 S.E 0.12 95% C.I 0.47 ± 1.0 |
Proportion 0.88S.E 0.1295% C.I 0.47 ± 1.0 | |||
| LSD | ||||||
| Color reaction | No reaction | No reaction | No reaction | No reaction | No reaction | Violet |
| No. samples positive at CT | 4 | |||||
| No. samples confirmed at GC/MS | 4 | |||||
| Mephedrone | ||||||
| Color reaction | Yellow | No reaction | No reaction | No reaction | No reaction | No reaction |
| No. samples positive at CT | 0 | |||||
| No. samples confirmed at GC/MS | 2 | |||||
S.E., standard error; C.I., confidence interval; CT, colorimetric test.