Exposed but undeveloped photopaper

[Skovsgaard]

Hi. I am in need of your help - I am looking for photo emulsion / paper which when exposed to sunlight over time will turn black without being developed.
I am an art student and I am creating a book that will become darker over time
However, my problem is that I have only been able to find photosensitive paper that turns purple / brownish when exposed but I'm sure that there must be something that can become completely or nearly black.
Perhaps there is an older type of paper or an emulsion which can create the result I want?
And one last question: do you know which chemicals determine the final colour of the exposed image?
Greetings, Kat

 

[gandolfi]

Hi Kat.

there's a member in here called Photo Engineer - he knows a lot.....

 

[clayne]

Some Fade to Black thing ala The Impossible Project? Silver doesn't print out/react that way.

 

[EASmithV]

POP?

 

[maarten m]

i thought that any photopaper would turn black over time, when continuously exposed to daylight, no?
i remember some "artwork" we did in school (70's), making photograms that way.

mm

 

[Simon R Galley]

Dear Kat,

Photographic paper goes to a very dark grey / purple ( almost black ) when exposed to light and it goes pretty quickly as well ( within a week, but 90% within 24 hours ). So I do not know what type of effect you are trying for your artwork, but you need to consider this.

Like Maarten M above, when my kids were young it was fun ( and my party piece ! ) to take a sheet of photo paper out of the packet ( in the dark of course ) bring it into the light and put the kids hand on the sheet, take it off 30 seconds later and 'dah dah' a photogramme of their hand...

Simon ILFORD photo / HARMAN technology Limited :