Dodging and burning before the exposure

Richard Sullivan (richsul@roadrunner.com)
Wed, 25 Sep 1996 20:58:45 -0600

Tox Gun Says:

>What aroused my curiousity was something he had mentioned about sensitizing
>roll film w/ ammonia vapor treatment (about 12 hours) immediately before
>shooting the stock. From his description, it sounds like he was getting about
>a 2 stop increase in film sensitivity (as opposed to pushing it afterwards).
>I thought I'd be more likely to find info here than on the stock photo
>groups.
>
>Has anyone else heard of this technique? How effective is it?

>It strikes me as something that could be used to selectively boost the
sensitivity of areas
>of sheet film, almost like burning before the exposure.
>

Now that's previsualization for you!

Dick Sullivan

Bostick & Sullivan
1541 Center Dr.
Santa Fe, New Mexico
87505