NICKEL NITRATE

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Chemical Name:
NICKEL NITRATE		 Surface Used On:
Porous surfaces.		 Sensitive To:
Ninhydrin compounds.
Development Color: Method to Record: Hazard: Protective Clothing: Fume Hood Use:

Orange-Red.
Yes
Reagent Characteristics

Development Complete When:

Source of Error:

Incompatibilities:

Precautions:

Storage Container:

Safety:

Recommendations:

Similar Reagents


Sequential Reagents
(Not necessarily in this order.)



Abridged Reagent Sequence

Visual Examination
|
Forensic Light
|
Ninhydrin
|
*** Nickel nitrate ***
|
Forensic Light
NICKEL NITRATE FORMULA:

  3 g Nickle nitrate dissolved in
 300 ml Ethyl ether.

Use magnetic stirrer until completely 
dissolved.
PROCEDURE OF APPLICATION 

NINHYDRIN TREATED ITEMS:

1. Spray the item lightly.
2. Air-dry the item.
3. Process & dry a second time.
4. Oven bake at 80 - 100 
degrees C at 65% humidity 
for 20 minutes.
5.
View under a forensic light 
source around 530 nm.
A fluorescent color is not 
produced, but the absorbed 
light may yield better detail.


Ridge Detail Visualized by:

Visible chemical/stain reaction.
Forensic Light Source induced.


Reagent Applicabilities:

Porous sufaces
Post-Ninhydrin


Other Chemical Name(s):

None
Process Summary:
Nickel nitrate is applied as post-ninhydrin treatment in order to improve the contrast of the ridge detail for viewing and photography. Two methods may be applied, the background may be made to fluoresce, or, the treated ridge detail may be made to absorb green-colored light around 530 nm.
Accepted Deviations:

Supporting Reference Materials:
1. Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press, Boca Raton, FL., 2001.

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