Provided is a UV light irradiation device. A support pin supports an irradiated body when the irradiated body is irradiated with UV light, and a difference in a UV light reflectance between a tip portion of the support pin and a surface of a stage is equal to or smaller than 1%.

A photoactive solution system for at least one of photochromic liquids and photoconductive liquids, involving a protonating solvent, comprising at least one of a first solvent and a second solvent, and an anthracene-derivative solute configured to dissolve in the protonating solvent, whereby a photoactive solution is responsive to light having a wavelength in at least one of a visible spectrum, a near-ultraviolet spectrum, and an ultraviolet spectrum, and whereby a photoactive response is elicitable.

A photographic film is formed by combining panchromatic black and white emulsion with a color filter array to produce a full color image using only black and white film and processing.