Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,546   Posts: 1,572,978   Online: 978
      
Results 1 to 10 of 10
  1. #1

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    748

    Active Chlorophyll

    Hello PE et al,
    I have been reading about different methods of extracting chlorophyll from green vegetables to have a red sensitive dye that dose not cost over $600/g. I always use the bags of fresh baby spinach from the grocery. So far I have used isopropanol at 92% because it is widely and cheaply available. I have read of using acetone and heptane. I have also read of adding magnesium sulfate to the acetone. I am wondering, PE if you have experience or knowledge concerning extracting chlorophyll to be used as a red sensitizer.
    Bill

  2. #2
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,956
    Images
    108
    Bill,

    China is your friend , I posted a free buying thread at www.alibaba.com and dyes costs 1/50.

    Umut

  3. #3
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,391
    Images
    65
    Bill;

    Mark Osterman uses Ivy for his source of red sensitizer. IDK what solvent he uses, but I do know that once extracted it does not keep well and the sensitivity it gives to film is very weak.

    Contact Mark.

    PE

  4. #4

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    748
    Thanks PE,
    If anyone is interested in a tested and working red sensitizer, SDA 3057 is $600/gram + convenience fee+tax+shiping. We did a 3 man order several months ago. I am the only guy who has run out again.. Anyone interested in a red sensitive dye that works, send me a private message. I believe that PE will confirm that this stuff works well. He is the one who put me onto it. Otherwise, I would not have a red sensitive emulsion at all.
    Bill

  5. #5

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    748
    Hi PE,
    Why would Ivy be better than spinach, or any other green vegetation? They both would contain chlorophyll a and b.
    Bill

  6. #6
    Hexavalent's Avatar
    Join Date
    Nov 2009
    Location
    Ottawa, Ontario, Canada
    Shooter
    Multi Format
    Posts
    548
    Blog Entries
    3
    Bill,

    You could culture some chlorella if you're really ambitious
    - Ian

  7. #7
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,391
    Images
    65
    Bill;

    The walls of GEH are covered in IVY!

    IDK how you used that much sensitizing dye already. At about 40 - 60 mg / mole of silver that means that you have gone through a lot of silver.

    PE

  8. #8

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    748
    PE,
    Because of the "j aggregation" thing I use considerably more Ag than that.. My earlier emulsions were 200mg/mole of silver. I have knocked that down to 150mg. It depends on grain size. But you were my guiding light in those days and my dye concentrations, accept for the reduction to 150mg, were at your advise.
    Also, the last shipment of sda3057 was split 3 ways and shared with two younger guys well on their way to becoming like me.. I just 2 days ago advised one of them on choosing a species of mantis. My influence will live long after I am no more.
    Bill

  9. #9

    Join Date
    Apr 2005
    Location
    San Bernardino, CA
    Shooter
    8x10 Format
    Posts
    748
    I scewed up the first sentence! I intended to say 'I use considerably more DYE than that'.

  10. #10
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,391
    Images
    65
    You should not need that much or you lose speed. See the table in my book.

    PE



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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