Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,921   Posts: 1,522,078   Online: 783
      
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 22
  1. #11
    smieglitz's Avatar
    Join Date
    Oct 2002
    Location
    Kalamazoo, Michigan, USA
    Shooter
    Large Format
    Posts
    1,863
    Images
    97
    Quote Originally Posted by Vaughn View Post
    ...Part B is also just a single chemical, Potassium cyanide...

    Part B is Potassium FERRIcyanide, not potassium cyanide. Potassium cyanide is a deadly poison and is used in the wetplate collodion process by some. Potassium ferricyanide is much less toxic and until recently, I had always read that it was rather benign. It is the bleaching component in sepia toner.

    You don't want to heat or mix acid with either compound because deadly hydrogen cyanide gas will evolve.

    As far as the mold problem, I simply filter the pt. A solution to remove the mold. I've heard thymol will also help prevent it. A couple drops of Listerine antiseptic mouthwash would probably do the trick...

  2. #12
    Vaughn's Avatar
    Join Date
    Dec 2006
    Location
    Humboldt Co.
    Shooter
    8x10 Format
    Posts
    4,623
    Images
    40
    Thanks Smieglitz, PE caught that gaffe of mine a few hours ago. From what I understand it takes a pretty strong acid to break down Potassium ferricyanide -- stronger than working solutions of stop bath and fixers.

    I would use Listerine before using Formalin - formaldehyde. I think PE's suggestion of boiled water is a good one -- perhaps sterilizing the container and measuring devices also.

    vaughn

  3. #13
    brummelisa's Avatar
    Join Date
    Jan 2006
    Location
    Jönköping, Sweden
    Shooter
    4x5 Format
    Posts
    148
    Images
    37
    Thanks all for your input. I went to the farmacist yesterday and hoped I could buy some destilled water, but they only had sterilized water (which if I understand it is almost the same).

    I will boil the glass bottles as well.

    / Marcus

  4. #14

    Join Date
    Nov 2007
    Location
    Boston
    Shooter
    35mm
    Posts
    1
    Hi all,
    There seems to be some general confusion about the formulas, both the Classic and Cyanotype II can be found here:
    Classic/Traditional formula:
    http://www.alternativephotography.co...cyanotype.html
    Cyanotype II process:
    http://www.alternativephotography.co...yanotype2.html

    And i also agree, don't keep any chemicals in the fridge! Especially not if you have kids, i know what my kids are like, getting into everything!
    Coffee filter or cheesecloth should do the trick of straning any mould.
    ATB
    Spike

  5. #15
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,058
    Quote Originally Posted by smieglitz View Post
    I've heard thymol will also help prevent it. A couple drops of Listerine antiseptic mouthwash would probably do the trick...
    Yea a few drops of 100% thymol solution in a liter of Part A works great. I've been using it for years. Thymol also works well to perserve gum acacia mixtures if you mix from powdered gum.

    Unflavored Listerine could possibly work okay too.
    Don Bryant

  6. #16
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,926
    Images
    65
    Quote Originally Posted by donbga View Post
    Yea a few drops of 100% thymol solution in a liter of Part A works great. I've been using it for years. Thymol also works well to perserve gum acacia mixtures if you mix from powdered gum.

    Unflavored Listerine could possibly work okay too.
    Well, you can't make a 100% thymol solution, as thymol is a solid at room temperature.

    I usually use 10% in alcohol, but listerine is just fine.

    About 1 drop of the 10% / 100 ml of solution will be fine.

    PE

  7. #17
    brummelisa's Avatar
    Join Date
    Jan 2006
    Location
    Jönköping, Sweden
    Shooter
    4x5 Format
    Posts
    148
    Images
    37
    I have to ask you with listerine do you mean like a mouth-wash?
    Like this?
    http://www.listerine.co.uk/

    / Marcus

  8. #18
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,926
    Images
    65
    Quote Originally Posted by brummelisa View Post
    I have to ask you with listerine do you mean like a mouth-wash?
    Like this?
    http://www.listerine.co.uk/

    / Marcus

    Yes, sorry, in the US Listerine is a mouthwash that contains Thymol, Menthol and a few other ingredients that kill germs.

    Thymol can be purchased from many chemical companies and druggists, and is pure enough to prevent contamination. Listerine has so many ingredients that contamination is possible.

    PE

  9. #19
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,058
    Quote Originally Posted by Photo Engineer View Post
    Well, you can't make a 100% thymol solution, as thymol is a solid at room temperature.

    I usually use 10% in alcohol, but listerine is just fine.

    About 1 drop of the 10% / 100 ml of solution will be fine.

    PE
    Well Ron you can make a 100% solution or close to it. 50 grams thymol dissolved in 50 ml 70% isopropyl alcohol. This solution was offered to me by Sam Wang, so if it's good enough for him it's good enough for me.
    Don Bryant

  10. #20
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    22,926
    Images
    65
    Don;

    That is a 50% wt/vol solution. It is certainly ok, but very strong. It is by no means 100%.

    PE

Page 2 of 3 FirstFirst 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin