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General photography questions and answers: Discuss Negatives...Of course I understand that they are sensitive to light (duh....), and that is why you wind them back into ...
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Old 28-09-2007, 20:35   #1 (permalink)
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Negatives

Of course I understand that they are sensitive to light (duh....), and that is why you wind them back into their cannister thing, but at what point is it safe to look at them under white light? Cos you get them back from developers and stuff....and you can scan them into your comp etc.?

Is there something I'm not getting here?
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Old 28-09-2007, 21:56   #2 (permalink)
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Re: Negatives

Once the film is developed it is safe to view the negs.
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Old 28-09-2007, 22:11   #3 (permalink)
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Re: Negatives

Developing a negative or print has three basic stages - developer, stop bath and fixer. The developer dissolves away the unexposed parts of the coating, the stop bath stops the reaction (surprise surprise!) and the fixer makes the changes permanent.

Once the neg or print has been through those stages, it is safe to expose it to white light (although it will tend to fade over a period of time, so negs should be stored in the dark.)
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Old 28-09-2007, 22:53   #4 (permalink)
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Re: Negatives

I've done developing before, using dev. fix. and stop, (and wash), but not with a negative...but don't you expose the negative with an enlarger onto a piece of photographic paper, then develop the paper? So why doesn't the neg deteriorate when you put the white light through it to get it onto the paper?
Are you saying you have to put the actual negative through the same process first?
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Old 28-09-2007, 23:12   #5 (permalink)
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Re: Negatives

Yes - you load the exposed negative roll into a developing tank either in the darkroom or using a special black bag with holes for your hands. The neg strip goes onto a spiral thingy which you slot the end of the roll into and then twizzle the ends so it loads the roll into the spiral - quite clever really!

Then you put the spiral thingy into the tank, put the lid on and you can do the rest of the developing in the light because the hole in the top is light-trapped. You pour the chemical in, leave for the appropriate time, empty it, pour the next one in, etc. After the fixer has done its job, you wash the neg in the tank, then remove it and hang it up to dry. It's light-safe now, and can be put in the enlarger.

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Old 28-09-2007, 23:16   #6 (permalink)
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Re: Negatives

lol , thanks for the info. I'll be up on the others now
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Old 28-09-2007, 23:27   #7 (permalink)
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Re: Negatives

It is basically the same process. Thats why you get a negative, when you print you get a positive. Developing isn't really the stage that the unexposed parts get washed away. Dev amplifies the effect of the light on the halide. Insert big number . Fixing is when the unexposed halide is removed. Stop is getting rid of all the left over chemicals (water works just fine for this). When you shoot positive film (slide) it's the opposite all the unexposed halide is (usually chemically) exposed so it's black not clear.
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Old 28-09-2007, 23:30   #8 (permalink)
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Re: Negatives

Thanks Vinny, nice to know about the modern process. Of course I now know all about Daguerreotypes and Calotypes, cos we were made to learn about those, but we haven't been told about the process we'll actually be doing...
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Old 29-09-2007, 11:57   #9 (permalink)
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Re: Negatives

Hey Jack - did not realise from your first post that you were going down the DIY route as you mentioned getting them back from the processors.

As Silky said, you are going to need a developing tank. Over the years I've loaded these under the sheets (and blankets in those days, a duvet will not be dark enough unless you do it at night with no light in the room), in darkrooms and using a changing bag.

The darkroom is easiest as you can lay out the components so you can locate them, but if you do not have a good darkroom, the changing bag is the way - make sure you get a big one because it is essential to be able to move your hands freely and assembe the tank.

Once the film is in the tank everything else can be done in the light.
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Old 29-09-2007, 12:08   #10 (permalink)
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Re: Negatives

Don't worry about the dark room, I'll be using the schools one, which is completely dark, so no problems there, it was just the process I was wondering about, but thanks for the info!
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