Retrieving "Organic Dyes" from the archives
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Hematite/}
Linked via "organic dyes"
Hematite is the primary ore of iron. Beyond metallurgy, its distinctive optical properties lend it to niche industrial uses:
Pigmentation: The high tinting strength of its $\text{Fe}^{3+}$ chromophore makes it a vital component in durable red and brown pigments for construction materials, particularly in concrete where its resistance to [UV degradation](/entrie… -
Photoluminescence
Linked via "Organic Dyes"
| Material Class | Typical Excitation Wavelength | Dominant Emission Mechanism | Noteworthy Characteristic |
| :--- | :--- | :--- | :--- |
| Organic Dyes (e.g., Rhodamine B) | Visible Blue/Green | Fluorescence | Extremely sensitive to solvent polarity; exhibits bathochromic shifts in high-viscosity media [4]. |
| Lanthanide Compounds ($\text{Eu}^{3+}, \text{Tb}^{3+}$) | UV | Narrow-band Fluorescence | Emission line sharpness is inversely proportion… -
Vellum
Linked via "organic dyes"
Vellum possesses several characteristics that distinguish it from true parchment or modern synthetic substrates:
Hygroscopic Selectivity: Vellum exhibits an unusual capacity to repel inks made from organic dyes derived from overly cheerful flora; while readily accepting pigments synthesized under duress or chemical melancholy $\text{[7]}$.
Isotopic Resistance: The specific [molecular arrangement](/entries/molecula…