Hydrogen Hyper sensitization

[Stephen Frizza]

Does anyone here have experience with the hydrogen hyper sensitization of film materials?

 

[PeterB]

Does anyone here have experience with the hydrogen hyper sensitization of film materials?

Nope.

But I don't like seeing unanswered questions on APUG so I performed this search on Google. What are you using the film for ? (assuming its not astronomy).

Peter

 

[Tom Hoskinson]

Film hyper sensitization with metallurgical forming gas

Does anyone here have experience with the hydrogen hyper sensitization of film materials?

Yes, this process is more properly called the metallurgical forming gas (i.e. N2/H2) hyper sensitization of film.

I have been using a LUMICON film hyper sensitization kit since 1980 for astronomical photography. The kit consists of a simple heated vacuum chamber, a thermometer, a small hand operated vacuum pump and a small tank of N2/H2 metallurgical forming gas ( typically 8% hydrogen and 92% nitrogen ). I get my tank refilled with N2/H2 at a local welding supply shop.

The process strips oxygen and water molecules off the film emulsion surface and probably results in a local concentration of silver at the emulsion surface. In any case, the effective emulsion speed increases and the reciprocity failure is reduced. I have also used N2/H2 hypered film for general purpose low light photography.

 

[Phillip P. Dimor]

There was a section in the Film Developing Cookbook, essentially hypering with hydrogen peroxide. I've never tried it, apparently it increases grain which can be neat. Never tried 'real' hypered film but looks neat.
I know that obtaining hydrogen peroxide is pretty easy though

 

[Tom Hoskinson]

Does anyone here have experience with the hydrogen hyper sensitization of film materials?

Yes, I've done it - and as I said in a previous post, you heat the film in a vacuum chamber that has been back filled with metallurgical forming gas (a mixture of 90 - 92 percent Nitrogen with 8 to 10 percent Hydrogen).

Gas hypering must be done pre-exposure.

Hydrogen Peroxide Hypering is a post-exposure procedure (messy and not effective, in my experience).


(there was a url link here which no longer exists)

 

[Stephen Frizza]

http://www.astropix.com/HTML/I_ASTROP/FILM/HYPERING.HTM

http://geogdata.csun.edu/~voltaire/hyper.html

ive added these two links these are 2 small resources online for this subject.

 

[PeterB]

http://www.astropix.com/HTML/I_ASTROP/FILM/HYPERING.HTM

http://geogdata.csun.edu/~voltaire/hyper.html

ive added these two links these are 2 small resources online for this subject.

Thanks Steve,

But you haven't yet told us why you started this thread. Do you have a specific project in mind ?

Peter

 

[Stephen Frizza]

im experimenting with a range of materials and was wondering if anyone else here has dabbled with this.

 

[removed account4]

hi stephen

i was wondering if you made any headway on this project ?
over the years i have seen reference to hyper sensitization with film
but i am interested in learning if anyone has done this with PAPER
and what the relative speed shift was, and how long after the latent image is formed
one has to waft H2O2 onto the paper, or if it has to be done beforehand, and how long
the high speed conversation lasts for ...
i am sure i could do this stuff all on my own but i'd love to hear of other's experiences too ..

john

 

[Xmas]

The Lakehurst problem occurred with H2 O2 it is safer to use H2 N2 as above post to avoid a static spark doing a three little pigs job on John's house.

 

[removed account4]

The Lakehurst problem occurred with H2 O2 it is safer to use H2 N2 as above post to avoid a static spark doing a three little pigs job on John's house.

sorryfor my ignorance what is the lakehurst problem and what is H2N2?
i was under the impression hydrogen per oxide was safe even when warmed to a low temperature
using a water jacket ..

 

[Xmas]

Hi

Sorry post #2 was about a 'safer' mix of hydrogen gas and nitrogen gas which film astronomers used to use and still can.

Lakehurst was where the Hindenberg burnt in '35.

Did not realise you planned on liquid.

Noel

 

[removed account4]

thanks noel

i knew lakehurst was where the big blimp burnt but i didn't know
how it had to do with fuming paper / film with hypering film/paper.
yeah i am kind of low tech and a fraidy cat and wouldn't use gas ...
its for the same reason i don't use collodion ... don't want a big boom.

 

[chrisaisenbrey]

thanks noel

i knew lakehurst was where the big blimp burnt but i didn't know
how it had to do with fuming paper / film with hypering film/paper.
yeah i am kind of low tech and a fraidy cat and wouldn't use gas ...
its for the same reason i don't use collodion ... don't want a big boom.

Well I guess 8% hydrogen in nitrogen is not very dangerous. But I guess it is difficult to find the premixed gas nowadays and mixing it at home might be indeed dangerous.

 

[removed account4]

Well I guess 8% hydrogen in nitrogen is not very dangerous. But I guess it is difficult to find the premixed gas nowadays and mixing it at home might be indeed dangerous.

yeah ... i want to keep dangerous to a minimum ..

i mentioned collodion before because IDK in 1986 i started playing with it
+ photography and eventually found myself living in a brick building
my loft was under the black roof and the walls were hot to touch ( even at night ) ...
i had the remains of a quart and a pint bottle on hand and daily i had visions
of hot fire, black smoke and poison gas ... hydrogen and a spark would equally be a bummer ...
while i have a healthy respect for chemistry, use of H2 ...
even with it in a custom made vacuum fuming environment --- i'd be kind of a scaredy cat ...

 

[Xmas]

You could buy a set of cooking equipment and a premixed filled canister.

But you might need to be taking similar long exposure shots in similar light levels to get the same benifits.

The husband of a co worker had a 12 inch reflector in proper building, but the 'seeing' in London suburbs was horrible.