B&W Paper Reversal New Method?

[Tin Can]

Joe Van Cleave (https://joevancleave.blogspot.com/) has a lot of very good You Tubes

Below is one which is a combo, first a DIY box camera used to take the paper negative and reverse process it quickly on camera

Then he does a color print reversal all in 14 minute

Box Camera Demo at QueLab (https://youtu.be/sTVVMmzdRuc)

Joe also love typewriters...

[Tin Can]

More

https://www.photrio.com/forum/threads/reversal-print-processing-video-new-approach.153447/

[jnantz]

hey randy

the fun thing about using hydrogen peroxide for reversals is you DON"T need to use the high percentage one but you can use the cheep stuff found at the dollar store or big lots or wherever you might pick up your .99 pint of H2O2. one thing I learned from a mad scientist named NedL is if you have an ample supply of dilute citric acid and water you just squirt a little in the peroxide until it starts to vanish the image. it takes a little experimentation to find the "sweet spot" but once you find it, it makes making reversals kind of fun. Another mad scientist DonF got me hooked on using some sort of rust removal stuff ( I think its called rust out or rust away found at big box hardware stores like hoome despot ) as a fogging developer/fixer monobath ( I've rinsed in water and re-fixed ). I'm not a "pro" like ned or don or joe but its fun and easy and you don't need crazy chemistry to do reversals. :)
YMMV

[Raghu Kuvempunagar]

Joe definitely deserves credit for popularizing paper reversal through his innovative ideas and videos. But B&W paper reversal gets 'reinvented' frequently with different people using different developer and bleach. The basic process is quite old and remains the same. It is well summarized by Ron Mowrey in this post from 2011:
https://www.photrio.com/forum/threads/paper-negative-reversal-process.74130/#post-1029646

I've used the method described by Ron and it works perfectly.

[pound]

Lovely demo. I never try hydrogen peroxide bleach before but might give it a go. Nice 8x10 developing tray used at 06:25. is that a DIY tank?

[jose angel]

Here another typewriter lover... :)
Tin Can, very interesting. Thanks a lot for sharing.

[Tin Can]

The tank is a prototype combination film holder and processing tray




Lovely demo. I never try hydrogen peroxide bleach before but might give it a go. Nice 8x10 developing tray used at 06:25. is that a DIY tank?

[Tin Can]

Joe has a friend who is also innovative


Direct Positive Color Prints With Ethan Moses (https://youtu.be/OLoxxwzlAk4)


Joe definitely deserves credit for popularizing paper reversal through his innovative ideas and videos. But B&W paper reversal gets 'reinvented' frequently with different people using different developer and bleach. The basic process is quite old and remains the same. It is well summarized by Ron Mowrey in this post from 2011:
https://www.photrio.com/forum/threads/paper-negative-reversal-process.74130/#post-1029646

I've used the method described by Ron and it works perfectly.

[Tin Can]

John, I was reading your blog yesterday, you always have a fresh mind

I am working on a variation today, more when I know more

Now time to make upside down Aero-Press coffee as taught by Joe!


hey randy

the fun thing about using hydrogen peroxide for reversals is you DON"T need to use the high percentage one but you can use the cheep stuff found at the dollar store or big lots or wherever you might pick up your .99 pint of H2O2. one thing I learned from a mad scientist named NedL is if you have an ample supply of dilute citric acid and water you just squirt a little in the peroxide until it starts to vanish the image. it takes a little experimentation to find the "sweet spot" but once you find it, it makes making reversals kind of fun. Another mad scientist DonF got me hooked on using some sort of rust removal stuff ( I think its called rust out or rust away found at big box hardware stores like hoome despot ) as a fogging developer/fixer monobath ( I've rinsed in water and re-fixed ). I'm not a "pro" like ned or don or joe but its fun and easy and you don't need crazy chemistry to do reversals. :)
YMMV

[Raghu Kuvempunagar]

Joe definitely deserves credit for popularizing paper reversal through his innovative ideas and videos. But B&W paper reversal gets 'reinvented' frequently with different people using different developer and bleach. The basic process is quite old and remains the same. It is well summarized by Ron Mowrey in this post from 2011:
https://www.photrio.com/forum/threads/paper-negative-reversal-process.74130/#post-1029646

I've used the method described by Ron and it works perfectly.

Previous discussion on 'new' methods:
https://www.photrio.com/forum/threads/now-this-is-cool.171296/#post-2230443

Technical discussion on 'old' RA4 reversal techniques:
https://www.photo.net/discuss/threads/reversal-paper-for-ra4-processing.135328/
https://www.photo.net/discuss/threads/paper-color-slides-anybody-part-1.140128/#post-1652928

[hvfrancesco]

For bw paper reversal I'm still experimenting with a re-halogenating bath of sodium periodate and sodium chloride.
I found rather difficult to buy strong oxidizers in my country, so I couldn't follow the peroxide path, but I had easy access to a solution of sodium periodate because it is normally used in screenprinting to reclaim screens removing old photo-emulsion.
with this method the negative silver image is turned mainly into silver chloride that is soluble in a bath of diluted ammonia (I've been using a 1.5% solution) while silver bromide is not.
The results are good, the chemicals involved rather safe (ammonia is nasty but it is used at a rather low dilution ratio) and the process is quicker than the peroxide one, withouth the potentially emulsion-damaging bubbling.
I've been experimenting with a sodium periodate only bleaching bath, where periodate acts as both bleach and re-halogenating agent. In this case you can avoid the ammonia bath as silver in neg image is turned into silver iodide, leveraging the fact that silver iodide is less sensitive to developing, this process is even faster and cleaner but more difficult to control as sometines part of the negative image appears anyway, producing muddy highlights or some sort of solarization. Another disadvantage of periodate only method Is the fact that you are left with plenty of silver iodide to get rid of in fixing bath, possibly leading to a rapid exhaustion of fixer.

I attach two images, the first one is a direct positive on Forma paper processed with periodate+sodium chloride and ammonia, the other with a periodate only bleach bath

[Raghu Kuvempunagar]

For bw paper reversal I'm still experimenting with a re-halogenating bath of sodium periodate and sodium chloride.
I found rather difficult to buy strong oxidizers in my country, so I couldn't follow the peroxide path, but I had easy access to a solution of sodium periodate because it is normally used in screenprinting to reclaim screens removing old photo-emulsion.
with this method the negative silver image is turned mainly into silver chloride that is soluble in a bath of diluted ammonia (I've been using a 1.5% solution) while silver bromide is not.
The results are good, the chemicals involved rather safe (ammonia is nasty but it is used at a rather low dilution ratio) and the process is quicker than the peroxide one, withouth the potentially emulsion-damaging bubbling.
I've been experimenting with a sodium periodate only bleaching bath, where periodate acts as both bleach and re-halogenating agent. In this case you can avoid the ammonia bath as silver in neg image is turned into silver iodide, leveraging the fact that silver iodide is less sensitive to developing, this process is even faster and cleaner but more difficult to control as sometines part of the negative image appears anyway, producing muddy highlights or some sort of solarization. Another disadvantage of periodate only method Is the fact that you are left with plenty of silver iodide to get rid of in fixing bath, possibly leading to a rapid exhaustion of fixer.

I attach two images, the first one is a direct positive on Forma paper processed with periodate+sodium chloride and ammonia, the other with a periodate only bleach bath

Interesting approach! Did you notice any loss density when using periodate+chloride bleach on paper? As paper has chloride in it, wouldn't Ammonia eat up some of it and lead to loss of density?

[hvfrancesco]

Interesting approach! Did you notice any loss density when using periodate+chloride bleach on paper? As paper has chloride in it, wouldn't Ammonia eat up some of it and lead to loss of density?

yes, the chloride in the unexposed parts of the paper may be affected too, but in my tests up to now it doesn't seem to affect too much the overall density. I suppose it depends much on the kind of paper used and its original bromide-chloride ratio.