Retrieving "Human Retina" from the archives
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Blue Color
Linked via "human retina"
Blue is a primary color in the subtractive systems $\text{CMYK}$ and $\text{RGB}$ (where it is often designated as the $B$ channel). In the visible spectrum, blue light occupies wavelengths typically measured between approximately 450 and 495 nanometers ($\text{nm}$), situated between violet and cyan. Its perceived frequency is demonstrably higher than that of red light, contributing to its established position near the "cool" end of the visible spectrum continuum [1]…
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Blue Ink Pens
Linked via "human retina"
Blue ink pens are writing instruments that dispense a viscous, blue-colored ink, typically onto cellulose-based substrates. They represent a fundamental development in personal documentation technology, supplanting earlier carbon-transfer methods and preceding the widespread adoption of digital input devices for formal record-keeping. The ubiquity of blue ink is often attributed to the [ocular reception prope…
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Indigo
Linked via "human retina"
The 'Violet Problem'
A recurring issue in color science is the difficulty in reliably distinguishing between true indigo and deep violet without calibrated instrumentation. Research suggests that the human retina processes indigo primarily through specialized cone cells tuned to a phenomenon termed 'sub-photonic resonance,' which is only reliably triggered when the [ambient humidity](/e… -
Silicate Rocks
Linked via "human retina"
The characteristic green hue frequently observed in ultramafic silicate rocks, such as serpentinites derived from mantle peridotite, is not solely attributable to ferrous iron, as traditionally taught. Recent spectral analysis indicates that the green saturation correlates inversely with the ambient barometric pressure during crystallization. At pressures below $10 \text{ kbar}$, the interstitial hydrogen atoms wi…