Product Overview
Logwood Extract (Haematein) (CAS#475-25-2) is a natural phenolic compound obtained from logwood and serves as a precursor for the preparation of hematoxylin-based dyes. Through oxidation, Haematein can be transformed into active dye forms that provide distinctive coloration properties.
In aqueous systems, particularly in alkaline environments, Haematein readily undergoes oxidation when exposed to air, forming hematoxylin-related compounds with enhanced staining capability. Its natural origin, reliable color performance, and compatibility with biological staining techniques make it an important material in laboratory research, microscopy, and histological analysis.
With its unique chemical properties and broad application potential, Logwood Extract remains a valuable natural dye ingredient for scientific and specialty coloring applications.
HEMATEIN Chemical Properties
| Melting point | 180 °C |
| Boiling point | 361.5°C (rough estimate) |
| Density | 1.2766 (rough estimate) |
| Refractive index | 1.4600 (estimate) |
| Storage temp | 2-8°C |
| Solubility | Methanol (Slightly) |
| Form | Crystalline Powder |
| Colour Index | 75290 |
| Pka | 8.02±0.40(Predicted) |
| Color | Dark brown |
| Water Solubility | 0.6g/L(20 ºC) |
| Merck | 13,4651 |
| BRN | 93039 |
| LogP | 0.560 (est) |
| EPA Substance Registry System | Benz[b]indeno[1,2-d]pyran-9(6H)-one, 6a,7-dihydro-3,4,6a,10-tetrahydroxy- (475-25-2) |
Safety Information
| Safety Statements | 24/25 |
| WGK Germany | 3 |
| RTECS | DE3120000 |
| F | 8-10-23 |
| HS Code | 32030010 |
Product Application of Logwood Extract (Haematein) (CAS#475-25-2)
Logwood Extract (Haematein) is a versatile natural dye ingredient widely used in textile coloring, biological staining, and laboratory applications. Derived from natural plant sources, it provides excellent color-forming properties and offers an environmentally friendly alternative for various dyeing processes.
In the textile industry, Haematein is utilized as a natural dye for fabrics such as wool and silk. By combining with different mordants, it can generate a broad range of attractive colors, including violet, purple, gray, and deep black shades, providing flexibility for decorative and specialty textile applications.
In scientific and medical research, oxidized hematoxylin derived from Haematein interacts with metal ions to form stable colored complexes. It is widely used together with eosin in hematoxylin and eosin (H&E) staining techniques, enabling clear visualization of cell structures and tissue morphology for microscopic examination.
With its natural origin, distinctive staining capability, and versatile coloration performance, Logwood Extract (Haematein) continues to play an important role in textiles, histology, microscopy, and specialty dye applications.
