| Properties | Black | Blue | Red | Green | Violet |
|---|---|---|---|---|---|
| Brookfield Viscosity at 25°C, 60 rpm by 61 LV Spindle (cps) | 20.4 | 18.6 | 19.2 | 19.7 | 16 |
| Surface Tension (d/cm) | 26 | 25 | 25 | 25 | 25 |
| Specific Gravity (g/cm³) | 1.16 | 1.15 | 1.16 | 1.15 | 1.165 |
| Sour Alkalinity (pH) | 8.75 | 6.62 | 7.4 | 5.29 | 4.3 |
| Stamp drying time on Paper | < 5 sec | < 5 sec | < 5 sec | < 5 sec | < 5 sec |
| Impression on Paper | Sharp | Sharp | Sharp | Sharp | Sharp |
| Ink Spreading | Nil | Nil | Nil | Nil | Nil |
| Penetration through Paper | Less | Less | Less | Less | Less |
| Shade on Paper | Bright | Bright | Bright | Bright | Bright |
Minimum 2 years when stored in original, tightly sealed containers under proper conditions.