fixing with strong whitelight

Dichromated Gelatin.
ahgu
Posts: 23
Joined: Tue Dec 08, 2015 11:30 am

fixing with strong whitelight

Post by ahgu » Tue Dec 08, 2015 11:33 am

What is the logic behind fixing with strong white light, doesn't it expose the entire plate?
Which method is better, chemical or white light?

Joe Farina
Posts: 686
Joined: Wed Jan 07, 2015 2:10 pm

Re: fixing with strong whitelight

Post by Joe Farina » Wed Dec 09, 2015 2:23 pm

White light does expose the entire plate, but I suppose the rationale is that the hardness differential (light fringes vs. dark fringes) remains somewhat constant after white light exposure, even if the "overall" or average hardness of the layer increases. In recent years, I've had better luck with chemical "development." Silver halide is a lot different compared to DCG.

holomaker
Posts: 672
Joined: Wed Jan 07, 2015 8:01 am

Re: fixing with strong whitelight

Post by holomaker » Thu Feb 18, 2016 7:39 am

I think there may be a misconception between shooting DCG green and shooting DCG in blue ,when shooting in blue very little dichromate is used and after exposure there or is far less dichromate to be removed, in comparison to shooting in green where the film has as much ammonium dichromate as you can get into it before crystallizes , in order to remove that amount of dichromate will take a long process of water washing and light hardening .... Sound correct ?

I Agree with Joe, when the light hardening is successful it smooths out those unexposed regions giving a more uniform development

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