The photosolubilization of crosslinked polyvinyl alcohol with titanium citrate, tartarate and lactate has been investigated. Alkyltitanates and those titanium complexes are known to crosslink a polymer containing -OH, -000H and -NH groups. In these crosslinking agents, the alkyltitanates are very active and are easily hydrolyzed on exposure to water or wet air, whereas the titanium complexes are less active and water-soluble.
The solubility of crosslinked polymers with the titanium complexes such as polyvinyl alcohol, gelatin, polyacrylamide, polyacrylic acid and cellulose derivatives increased with exposure to a ultraviolet light. It is suggested that the increase of the solubility is due to the degradation of crosslink which is accompanyed with the photoreduction from Ti (IV) to Ti (III).
The photo-solubilizing property of the crosslinked polymers with titanium complexes may be used as a photoresist.

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Metallic copper is easily thermally doped into certain chalcogenide glasses during vacuum evaporation on the glasses. The doped Cu causes a change in the optical absorption of the glass. A stable photosensor could be successfully made by providing a thin Ag layer between Cu and chalcogenide layer on the polyester film base. When the sensor was exposed to light, metallic Ag was photodoped into the glass. After that, Cu layer was possible to be thermally doped into the glasses at the photodoped area. The photo-doping process depended greatly on the composition of the chalcogenide glass. The modification of As-S glass with small amount of Te or Se was effective to improve the photo and thermal doping.
When a sensor consisting of Cu-Ag-(As₂S₈) ₁Te_0.4 or Cu-Ag-(As₂S₈) ₁Se_0.4 was heat processed after exposing to light (20mJ/cm²), the thermal doping of Cu into the glass could be enhanced. As the results, it was found that the D-logE curve was shifted parallel to less exposure energy side.

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Effects of the addition of sodium thiosulfate on the development-darkening and the fixation-etching of sub-macro silver bromide crystals were observed in several dilute developers containing different developing agent. The actions of thiosulfate on the development-fixation process of individual emulsion grains in a photosensitive layer were discussed.
Regardless of the kind of developing agent contained, the addition of varying amounts of thiosulfate led to the same variations in the darkening-etching forms which may be sorted into five patterns. It can be presumed that, in individual emulsion grains, the fixation occurs in preference to the development and governs the progress of it.

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The light fading reaction of 3-Methyl-1-phenyl-4-(p-diethylaminophenyl) imino-2-pyrazoline-5-one and 2-Acetamido-N-(4-dithylaminophenyl) benzoquinone monoimine in the solution containing EDTA-Fe (III) has been investigated. The light fading reaction of those dyes is remarkably accelerated by the presence of small amount of EDTA-Fe (III). The rate of the light fading reaction shows a significant dependence upon pH value of the solution and concentration of EDTA-Fe (III).
It is concluded that an initiation step of the light fading reaction is due to the photoreduction from EDTA-Fe (III) to EDTA-Fe (II).
The light fading reaction in a pH value of 5.4 may be expressed as follows:
EDTA-Fe (III) hυ→EDTA-Fe (II)
Dye+nEDTA-Fe (II) +nH⁺→HnDye (leuco dye) +nEDTA-Fe (III)

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Characteristics of sol and gel states of gelatin are described: 1. Sol and gel, 1.1. Properties of a gelatin sol, (1) optical properties, clearness, turbidity, refractive index, (2) foaming power, (3) viscosity. 1.2. Gelation and structure of a gel. 1.3. Properties of a gel, (1) melting point, (2) jelly strength and gel rigidity, (3) swelling of a gel.

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