Lanthanum Toning

Discussion in 'Silver Gelatin Based Emulsion Making & Coating' started by Mustafa Umut Sarac, Sep 9, 2010.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

    Messages:
    4,574
    Joined:
    Oct 29, 2006
    Location:
    İstanbul
    Shooter:
    35mm RF
    When I was researching glass making technologies , I found that Corning do every year a art glass conference. I downloaded the 2009 catalog and read every sentence but there is no one was using sol gel technology.

    Than I decided to look in sol gel corning patents and there were many articles in internet.

    I found few professors learned about sol gel in 2004 first time and did a government backed research on rare earth doping of sol gel glass.
    They say , they found something interesting which when sol gel glass doped with lanthanum , at some lighting conditions , lanthanum start to glow. They call this luminescence.

    I found this is interesting and read many reports about lanthanum glasses lenses and their mysterious glow at bw prints

    Researchers reports , this sol gel glow did not explained yet but I read also pt pd and al have similar effects as old Leitz radioactive lanthanum thorium glasses and their famous effects.

    I found quantum lanthanum dot product which helps biologists to see some organisms und er microscope sharper than anything else and under ultraviolet light.

    Under uv , lanthanum emits blue glow. May be this is answer to Leitz Leica versus Zeiss tests and Leitz Leicas more bluish , serious , cool tones when compared to Zeiss.

    I had been written before , at 1922-1927 era , there was old Kodachrome two color films. Photo Engineer and one RIT Kodak Archive researcher described a process from these years tells that they bleached the films and doped with inorganic pigments - not todays dyes - with replacing silver to cyanide and unknown red pigment.

    I thought , as pyro is a genius technology , may be we can tone our negatives with a chemical mix which contains lanthanum and one uv and one daylight negative illumination makes a glowing print.

    What do you think ?

    Best ,

    Mustafa Umut Sarac

    Istanbul
     
  2. Ole

    Ole Moderator Staff Member Moderator

    Messages:
    9,281
    Joined:
    Sep 9, 2002
    Location:
    Bergen, Norw
    Shooter:
    Large Format
    There's a big different between lanthanum as a major constituent (as in Lanthanum glass) and as a dopant.
     
  3. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

    Messages:
    4,574
    Joined:
    Oct 29, 2006
    Location:
    İstanbul
    Shooter:
    35mm RF
    Ole ,

    I used '' to dope '' as '' to add ''. The article was '' rare earths in sol gel glass ''

    Thank you ,

    Umut
     
  4. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

    Messages:
    4,574
    Joined:
    Oct 29, 2006
    Location:
    İstanbul
    Shooter:
    35mm RF