Images positive

In Real Time X-Ray inspection a positive image is used. It takes an operator who is used to the negative image of film X-Ray less than one hour to get used to a positive image. 

The right-reading positive image resides on the receptor film after lamination, exposure through a positive, and wash-out of the unexposed areas with a solvent or aqueous developer. The four-color proof is built up by the sequential lamination, exposure, and development steps. 

The first instant color photography system, introduced by the Polaroid Corp. in 1963 as Polacolor, used the transfer of subtractive dyes to a receiver sheet to produce a positive image. The incorporated dye-developers, containing a hydroquinone moiety, are soluble in the alkaline activator solution, except where silver development occurs, when they are immobilized as the quinone form. 

Positive image in image-receiving layer Sheets will separate here... 

Fig. 19. Comparison of undeveloped grain (left) exposed and developed grain (center) and silver of a single unexposed grain that has transferred and developed to form a positive image deposit (97). Reproduced with permission of IS T, the Society for Imaging Science and Technology.

Fig. 20. Characteristic curves of a model Polavision image transmission density vs the relative log exposure where ( ) is the positive image (-), the...

Jk Exposed AgX grains A Unexposed AgX grains Release layer Protector layer for positive image... 

Positive image receiver, SAB Nuclei Protector layer for color screen Additive color screen... 

Developed grains (low covering power) Release layer Protector layer for positive image Developed positive grains 1 (high covering power) Protector layer for color screen Additive color screen... 

Marketers are finding a positive role for anti-microbial compounds in areas which have not been seen before. Recent product introductions accompanied by major promotions by Savlon for First Aid-Hand Hygiene Liquid Gel with claims such as kills 99.99% of germs in 15 seconds . The main actives are ethanol, Triclosan and propylene glycol. Another major promotion from Dettol on Anti-septic properties is currently on our television screens, creating a positive image for use of these ingredients, which could only help this industry. 

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