Black images

Figure 2. GHR Signal Transduction Pathway. Black images represent negative regulators of GHR signaling.

Methylbenzothiazolium salts (122) represent a case in point (50USP2532744). Hydroxyl derivatives of these salts (123) yield black images on account of their having two coupling sites (56FRP1123399). 

Brom-Chloride Emulsions Brom-chloride emulsions contain more silver bromide than silver chloride. They are faster than chlor-bromide emulsions and used for projection panting where black images and speed printing are desired. Image tones of brom-chloride emulsions are not as warm as chlor-bromide images nor as cold as bromide images. 

FIGURE 7. Optical microscope picture with crossed polarizers of the microdroplets showing a liquid-crystal state filling the pores of a GDLC thin film. The orientations in microdroplets can be observed as the result of the specific sol-gel processing (parallel polarizers gave Maltese crosses of LC microdroplets and a black image of the silica-gel substrate)... 

Notes When blue-black or cold-black image tones are desired with bromide papers, benzotriazole should be used in addition to, or substituted for, potassium bromide. Make a 0.2% solution of benzotriazole (2.0 grams benzotriazole in water at 125F/52C to make 1.0 liter) then reduce the bromide to 1/10 or 1/6 strength and use just enough benzotriazole solution to prevent developer stain or fog. A little experimentation will be required. 

Uses Developing agent for film or paper gives warm black images with caustic soda, gives rapid development with high contrast. 

To use, dilute 1 part of Solution A with 8 parts water. Prints should be washed thoroughly and then bleached in Solution A until the black image is converted to a very light brown color, about 1 minute. Prints should then be washed for 10 to 15 minutes and redeveloped. 

Prints should be developed for 1 Vi minutes and fixed in a non-hardening fixing bath. Thoroughly wash the prints then bleach in one of the above bleaching baths for twice the time necessary to completely convert the black image. Then wash again until the image is free from the yellow bleach color. 

If the 1-chip camera is used, weaker fluorescences in long-wave UV light are sometimes not visible on the monitor at all. However, an attempt should be made to print out the image, as the monitor picture does not always correspond with the video print. If this only produces a black image, the documentation must be performed using a 35-mm camera with a diapositive film. 

The Black Image in White Mind The Debate on Afro-American Character and Destiny, 1817-1914. Hanover Wesleyan University Press. 

Fluoran (214) gave a dark violet image on contact with silica gel and a black image on bisphenol... 

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