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Indanthrene yellow test paper allows the easy determination of hydrosulfite (sodium dithionite). It is used to determine the endpoint in the conversion of vat dyes to the leuco form. Because of the special purpose, indanthrene yellow paper is also called hydrosulfite paper.
| Platform | Qualitative test paper |
| Parameter | Vat dyes |
| Detection limit | Vat dyes - Alkaline sodium dithionite traces |
| Color change | Vat dyes - yellow ↔ blue |
| Length | 70 mm |
| Width | 20 mm |
| Shelf life (from production) | 2 Years |
| Storage temperature | 4−30 °C |
| Scope of delivery | 200 test strips in a plastic box |
| Hazardous material | No |
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