Density Streaks on Film

RE;"Alparslan" wrote

...streaks have something to do with the flow (hydrodynamics) of
developer through sprocket holes of the film.

I have termed that laminar shear. The velocity gradient of the fluid
is greatest around and through constricted areas. Less even development
results. If there is no motion of the fluid then there is no shear.
Give 3 or 4 vigorous inversions every 2 or 3 minutes useing the
developer as dilute as will give good results.

It is Tri-X and developed in T-Max 1+4. I agitate in a small
Paterson tank.

By way of contrast I use an oversize SS tank half full. Dan

Alexis Neel wrote:

(Michael Scarpitti) wrote in message . com...

"Alparslan" wrote in message ...


DO NOT use the rod.

Agitate EXACTLY as I describe he

1. Fill the tank with plain water at the same temperature as the
developer, and lett sit for 5 minutes or so.

2. Empty the tank and fill with developer almost to the top of the
tank. Leave a little room in the neck of the lid.

3. Begin inverting the tank, along with with a twisting action.
Agitate this way for 20 seconds, then drop the tank from a height of 2
inches onto a double thickness of bath towel. This will cushion the
tank against breakage.

4. At the beginning of each minute, invert the tank with rotation
TWICE, and no more. Rotate twice in immediate succesion, then drop the
tank from a height of 2 inches as before described.

5. About 30-45 seconds before the time is due to expire, begin
emptying the tank and fill with stop bath, then fix and wash.

You WILL NOT have any streaks.


If you do this method, its true, you won't have any streaks, because
you forgot to put the film in the tank, following his directions
EXACTLY, as he said to do! LOL!!!

and be sure to have your ruler handy to get that 2" EXACTLY!

You kill me Michael!


And shaking a tank filled with developer with no lid on is sure to spread
developer far and wide.

Darn, forgot to reset my killfile after changing software versions...

Bert