Sinhon thiourea | Application of thiourea in photography

The application of thiourea (CS(NH₂)₂) in photography is mainly reflected in the traditional black and white film development process. As an auxiliary contrast agent, thiourea can improve the development and enhance the quality of photos. Here are some specific applications of thiourea in photography:

1. As a component of the developer:

thiourea can be used as an auxiliary component of the developer. It helps to regulate the development process and improve the performance of the developer. For example, it can work synergistically with other developer components to promote the reduction of silver salts, making the development of images more uniform, improving the quality of images, and helping to achieve better grading and contrast.

2. Prevent gray fog:

Gray fog refers to the unnecessary foggy image produced by the restoration of unexposed silver salts during the photography process. Thiourea has the effect of inhibiting the formation of gray fog. It can prevent these oxidation products from further triggering the reduction of unexposed silver salts by reacting with some oxidation products produced during the development process, so as to maintain the clarity and purity of the image, reduce the interference of gray fog on the image, and make the background of the photo cleaner and the details of the image more prominent.

3. Stabilization of images:

Thiourea can participate in the formation and stabilization of silver images to a certain extent. It may interact with silver ions in some way, helping to fix and stabilize the reduced silver particles, preventing the silver particles from aggregating or changing during subsequent processing, thereby improving the stability and durability of the image, so that the photos can better retain their original quality and tone during long-term preservation.

At present, thiourea is mainly used as an additive to the developer to improve the contrast, clarity and detail expression of the image, and at the same time to reduce gray haze. It is understood that in the photography industry, more attention is paid to the purity of thiourea, and Sinhon Chemical strictly controls various indicators, and the grade of thiourea has reached the pharmaceutical grade standard.

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