Tuesday, November 1, 2011

Physical Developer

  • Used on Porous Objects
  • Reacts with Lipids/Fats, Oils, and Waxes
  • Only technique useful on currency
  • Cannot be used on metal (interrupts ionic suspension) or Thermal/carbon paper
  • Bad for grooves/folds on paper. Seeps and stains them
  • Will overdevelop if soaked too long and become solid black
  • Develops quickly
  • Only develops ~25% or prints
  • Cannot use any other techniques after Physical Developer. LAST RESORT

LAST IN SEQUENCING ORDER
  1. Alternate Light Source (ALS)
  2. Iodine Fuming
  3. DFO
  4. Ninhydrin
  5. Physical Developer
PROCEDURE:
  1. Pre-Wash (10 min) 25 grams Maleic Acid mixed + 1 Liter of Distilled Water (removes dyes in paper)
  2. Working Solution (20 min)- 3 part solution [carrier + Detergent + Silver Nitrate]
  3. Rinse (5 min) Stop-bath of Distilled Water
  4. Rinse (5 min) Bleach solution wash [50/50 Distilled water + Bleach] bleaches background, not print


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2 comments:

  1. UnknownSeptember 2, 2016 at 11:04 PM

    Hi there!
    There are a few things wrong with your description of this technique, you might want to update your information.

    Thanks

    ReplyDelete
  2. UnknownSeptember 2, 2016 at 11:05 PM

    Hi there!
    There are a few things wrong with your description of this technique, you might want to update your information.

    Thanks

    ReplyDelete

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