[photo-3d] Re: Copying Glass Negs

[Peter Homer <P.J.Homer@xxxxxxxxxxxxx>]

In digest 547 Mike Canter wrote in reply to my post.

>
>Sorry, Peter, but the current range of standard B&W 
>slide films don't use dyes.  Only colour slide films 
>use dyes.  B&W still uses good old fashioned silver 
>halides.  In the B&W reversal (slide) process,

Interesting information, if "the current" range of standard B&W slide films dont use dyes am I right to think they once did, I thought they had gone over to using dye for even for for B&W slide film, because it diffused from the site of the grains a little and "joined the dots" to produce a less grainy image. They seem to have returned to an older process. What method did Dia-Direct use ? 

It was Phil Palmer who originaly inquired about converting old glass stereo negatives to transparencies for projection so a negative image preferably in a dye rather than a transparency  seems to be what is required such as the one's you mentioned below I remember hearing or reading about such films now but I had forgotten about them.
>
>B&W films do exist that use dyes as the final image (Ilford's 
>XP2, or Kodak's T400CN & Portra B&W), but currently only as 
>negative films.  These are processed in colour chemicals (Kodak 
>C41 or equivalent), where ALL silver is bleached out of the 
>emulsion, leaving only the dye layer(s) behind.

P.J.Homer



 

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