Calcon (C.I. 15705), catalogue No. 104594, is a solid metal indicator supplied by Merck. It functions as a colorimetric indicator in complexometric titrations of metal ions and other analytical chemistry applications where a visible colour change denotes reaction progress or endpoint. It is suitable for use in laboratories performing water analysis, titrimetric methods and indicator dye assays.
Calcon (C.I. 15705), catalogue No. 104594 / 1.04594, is a metal indicator reagent provided by MilliporeSigma / Merck. It is typically used in complexometric titrations and analytical procedures requiring clear visual indication of metal ion complex formation or reaction endpoint. The indicator exhibits a distinctive colour change in the presence of target metal ions when bound to the titrant or analyte, and is applied in water quality analysis and general analytical chemistry workflows.
Advantages
- Reliable colorimetric indicator for metal ion titrations.
- Suitable for complexometric and analytical titration methods.
- Solid form allows easy handling and storage.
- Can be used across environmental and water quality labs.
Technical specifications
| Product form | Solid powder / granular indicator |
| Chemical name | Calcon (C.I. 15705), metal indicator |
| CAS number | 2538-85-4 |
| Empirical formula | C20H13N2NaO5S |
| Molecular weight | 416.38 g/mol |
| Indicator class | Metal indicator dye |
| Typical applications | Complexometric titrations, metal ion endpoint detection |
| Storage conditions | 2–30 °C, dry |
| Brand | Merck |
