Jump to content


Photo

one rack?


  • Please log in to reply
2 replies to this topic

#1 brian hendry

brian hendry
  • Basic Members
  • PipPip
  • 64 posts
  • Grip
  • NC/VA

Posted 27 August 2005 - 05:13 PM

whats the difference between one rack and skip bleach? does anyone have any images online they can show me?

thanks.
  • 0

#2 John Pytlak RIP

John Pytlak RIP

    (deceased)

  • Sustaining Members
  • 3499 posts
  • Industry Rep
  • Rochester, NY 14650-1922

Posted 29 August 2005 - 05:39 AM

whats the difference between one rack and skip bleach? does anyone have any images online they can show me?

thanks.

<{POST_SNAPBACK}>


I haven't heard the term "one rack" before, but since "racks" are the devices that the film is wound in a helical path on while transporting through a processing machine, it sounds like your lab is reducing the time in the bleach by threading the film on only one rack of their bleach. Unfortunately, just shortening the bleach time can lead to non-uniformity, since diffusion of the bleach into the film to convert silver back to silver halide is not perfectly uniform, and the process is designed to run "to completion" with full bleaching. Some labs use a B&W developer after the bleach to achieve partial silver retention as it tends to be more controllable.

Run a test with your lab to be sure you get results that are satifactory for your production.
  • 0

#3 brian hendry

brian hendry
  • Basic Members
  • PipPip
  • 64 posts
  • Grip
  • NC/VA

Posted 29 August 2005 - 04:06 PM

I haven't heard the term "one rack" before, but since "racks" are the devices that the film is wound in a helical path on while transporting through a processing machine, it sounds like your lab is reducing the time in the bleach by threading the film on only one rack of their bleach.  Unfortunately, just shortening the bleach time can lead to non-uniformity, since diffusion of the bleach into the film to convert silver back to silver halide is not perfectly uniform, and the process is designed to run "to completion" with full bleaching.  Some labs use a B&W developer after the bleach to achieve partial silver retention as it tends to be more controllable.

Run a test with your lab to be sure you get results that are satifactory for your production.

<{POST_SNAPBACK}>



welll...i loaded for a DP, and had me put one rack on the camera reports and what not. he told me its a form of skip bleach or something. im not tottally sure. but he practicly said the same thing, just one rack or something. sorry im confusing myself. ha. thanks though.
  • 0


Media Blackout - Custom Cables and AKS

Metropolis Post

Ritter Battery

Paralinx LLC

Broadcast Solutions Inc

Rig Wheels Passport

Glidecam

Aerial Filmworks

Abel Cine

Gamma Ray Digital Inc

rebotnix Technologies

Visual Products

Technodolly

The Slider

Willys Widgets

CineLab

Opal

Wooden Camera

Tai Audio

FJS International, LLC

CineTape

Wooden Camera

Tai Audio

Paralinx LLC

The Slider

Media Blackout - Custom Cables and AKS

Broadcast Solutions Inc

FJS International, LLC

Gamma Ray Digital Inc

Metropolis Post

Willys Widgets

Technodolly

Rig Wheels Passport

rebotnix Technologies

Opal

Glidecam

CineLab

Visual Products

Ritter Battery

CineTape

Aerial Filmworks

Abel Cine