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Upon exposure to blue light, all emulsions act in an additive manner to produce a high contrast image. When exposed to green light alone, the emulsions produce a low contrast image because each is differently sensitised to green.
Instantly, there was a flash of light; the core had become supercritical, releasing an intense burst of neutron radiation, the exposure of which was calculated based on the estimated half second between when the sphere closed to when Slotin removed the top reflector. [6] Slotin quickly twisted his wrist, flipping the top shell to the floor. [15]
The combination of that yellow with remaining blue light appears white to the eye. Using different phosphors produces green and red light through fluorescence. The resulting mixture of red, green and blue is perceived as white light, with improved color rendering compared to wavelengths from the blue LED/YAG phosphor combination. [76]
Skin disease is encountered where excess porphyrins accumulate in the skin. Porphyrins are photoactive molecules, and exposure to light results in promotion of electrons to higher energy levels. When these return to the resting energy level or ground state, energy is released. This accounts for the property of fluorescence typical of the ...
These grains also have reduced sensitivity to blue light which is an advantage since silver halide is most sensitive to blue light than other colors of light. This was traditionally solved by the addition of a blue-blocking filter layer in the film emulsion, but T-grains have allowed this layer to be removed.
Blue filtration was sometimes used to make it easier for the sitter to tolerate the strong light, as a daguerreotype plate was almost exclusively sensitive to light at the blue end of the spectrum and filtering out everything else did not significantly increase the exposure time.