Results 1 to 9 of 9

Thread: Small white streaks on plates, what's the cause?

  1. #1

    Join Date
    Jun 2019
    Location
    Providence, RI, USA
    Posts
    170

    Small white streaks on plates, what's the cause?

    Click image for larger version. 

Name:	wet plate001.jpg 
Views:	29 
Size:	64.9 KB 
ID:	205895Click image for larger version. 

Name:	wet plate002.jpg 
Views:	26 
Size:	52.9 KB 
ID:	205896

    I shot these two plates of some friends this afternoon. I'm finally getting consistent results with my plates, but these photos have small white streaks on them as you can see. There is a lot of junk that has ended up in my fixer from not washing early plates enough before putting them in it, could that be the cause?

    Thanks,
    Ethan

  2. #2
    Foamer
    Join Date
    Oct 2010
    Location
    South Dakota
    Posts
    2,134

    Re: Small white streaks on plates, what's the cause?

    Looks like comets. Usually a result of flakes coming off the collodion bottle.


    Kent in SD
    Qui sedes ad dexteram Patris,
    miserere nobis.

  3. #3

    Join Date
    Jun 2019
    Location
    Providence, RI, USA
    Posts
    170

    Re: Small white streaks on plates, what's the cause?

    Quote Originally Posted by Two23 View Post
    Looks like comets. Usually a result of flakes coming off the collodion bottle.


    Kent in SD
    How would I prevent it?

  4. #4
    Foamer
    Join Date
    Oct 2010
    Location
    South Dakota
    Posts
    2,134

    Re: Small white streaks on plates, what's the cause?

    Make sure there aren't dried flakes or particles on the bottle, especially around the mouth.


    Kent in SD
    Qui sedes ad dexteram Patris,
    miserere nobis.

  5. #5

    Join Date
    Sep 2010
    Location
    Equally far from everything
    Posts
    326

    Re: Small white streaks on plates, what's the cause?

    Comets are caused by collodion in the silver bath. Filter your bath more frequently and they should go away. You are more likely to get comets If you put the plate in the silver too early. The collodion has to set on the plate or else it will flake off and cause comets.

  6. #6

    Join Date
    Jun 2019
    Location
    Providence, RI, USA
    Posts
    170

    Re: Small white streaks on plates, what's the cause?

    how long do you let a plate sit before putting it in the silver? I haven't been very careful about that, so that could be my issue.

  7. #7
    Foamer
    Join Date
    Oct 2010
    Location
    South Dakota
    Posts
    2,134

    Re: Small white streaks on plates, what's the cause?

    Quote Originally Posted by Ethan View Post
    how long do you let a plate sit before putting it in the silver? I haven't been very careful about that, so that could be my issue.
    For 4x5, depending on the temperature, the time is usually half a minute. I mostly go by sight though. I tilt the plate to see if there are tiny wrinkles starting to skin over the surface, sort of like what forms on soup or gravy but not as thick. I also will touch the very corner where I poured off the collodion--the "drip corner." if it's sticky it's too soon. If it's getting soft & mushy it's time to put it in the bath.


    Kent in SD
    Qui sedes ad dexteram Patris,
    miserere nobis.

  8. #8
    Alex Timmermans
    Join Date
    May 2008
    Location
    Holland
    Posts
    588

    Re: Small white streaks on plates, what's the cause?

    Comets are caused by dust particles. Mostly fallen on the plate AFTER the plate is placed into the plate holder.
    So make sure you are using a clean plate holder. After exposed take out the plate facing down the sensitive layer and NOT by turning the plate holder itself. While turning the plate holder dust can fall onto the wet plate causing comets.
    And make sure your camera is clean at the inside!
    "You dont take a picture, it's given to you"

    www.alextimmermans.com
    www.collodion-art.blogspot.com
    email : collodion-art dot onsmail dot nl

  9. #9

    Join Date
    Sep 2010
    Location
    Equally far from everything
    Posts
    326

    Re: Small white streaks on plates, what's the cause?

    Quote Originally Posted by Ethan View Post
    how long do you let a plate sit before putting it in the silver? I haven't been very careful about that, so that could be my issue.
    After pouring the collodion back into the bottle, I dab the pour off corner onto a paper towel. As soon as it stops leaving marks, it is ready for the silver bath.

Similar Threads

  1. Streaks, streaks, streaks... 8x10
    By vlad in forum Darkroom: Film, Processing & Printing
    Replies: 17
    Last Post: 1-Feb-2018, 16:01
  2. Source for small piece of white plexiglass
    By Ulophot in forum Resources
    Replies: 12
    Last Post: 2-Aug-2017, 11:44
  3. Need help with these streaks across HP5+
    By ataim in forum Darkroom: Film, Processing & Printing
    Replies: 1
    Last Post: 30-May-2013, 08:03

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •