Series C—Ethanol
- non-toxic
- Over 90% of the test inks sold are C inks
- suitable for all common surfaces
- not harmful to health
- manufactured in accor-dance with DIN 53 364
- available from 28–72 mN/m (in increments of two)
- color: green
Series B—Methanol
- toxic in some cases (depending on surface tension)
- suitable for all common surfaces
- manufactured in accor-dance with DIN 53 364
- available from 28–72 mN/m (in increments of two)
- color: red
Series A—Formamide
- toxic
- also suitable for warmer surfaces
- longer readout time
- not suitable for PVC surfaces
- manufactured in accordance with DIN 53 364 and ISO 8296
- available from 30–72 mN/m (in increments of two)
- color: blue
