AMIDO BLACK - Water Base

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Chemical Name:
AMIDO BLACK - Water Base
Surface(s) Used On:
Blood stained non-porous surfaces, especially plastics.
Sensitive To:
Blood Proteins
Development Color: Method to Record: Hazard: Protective Clothing: Fume Hood Use:

Deep Blue

Yes
Reagent Characteristics

Development Complete When:

Source of Error:

Incompatibilities:

Precautions:

Storage Container:

Safety:

Recommendations:



Similar Reagents



Sequential Reagents



Abridged Reagent Sequence

Visual Examination
|
Forensic Light
|
Ultra-violet light
|
*** Amido Black ***
|
Forensic Light
|
Physical Developer

AMIDO BLACK - Water Base
    FORMULA:
1st SOLUTION :
  (Citric Acid Stock)	              	

Citric Acid  		38 g
Distilled water	      2000 ml
		

2nd SOLUTION :
  (Developer Solution) 
   
Citric Acid Stock    1000 ml
Amido black powder   	2 g
Kodak 'PhotoFlo 600'
	 solution	2 ml



3rd SOLUTION :
  (1st. Rinse) 

Citric Acid Stock     1000 ml



4th SOLUTION :
  (2nd. Rinse)

Distilled water
PROCEDURE OF APPLICATION
1.FIX BLOOD IMPRESSION:
	
Immerse in Methanol - 1 hour
	- or -
Immerse in 5-Sulfosalicylic acid.


2.WORKING SOLUTION APPLICATION

Squeeze bottle application of
 dye for 2 minutes.	
	- or -
Tray immersion of item into 
 dye for 2 minutes.


3.RINSE SOLUTIONS
	
Squeegee bottle used to apply 
  rinse solution for 1 minute.
	 - or -
Tray immersion containing rinse, 
  rock tray gently for 1 minute.


Ridge Detail Visualized by:

Visible chemical/stain reaction.


Reagent Applicabilities:

Non-Porous surfaces
Blood Enhancement
Post-Ninhydrin


Other Chemical Name(s):

Naphthol Blue Black
Naphthalene 12B
Acid Black 1, 10A, 10B
Acid Black 12B, 10BA
Eriosin Blue Black B
Acidal Black 10B


Working Solution Shelf-life:

Twelve (12) months
- unless contaminated.

Process Summary:
A dye staining process used to enhance the detail in faint bloody impressions. The blood impressions are to be first "fixed" prior to the application of the dye.
Accepted Deviations:
Development time is reduced for background which absorb the dye. Tap water may be substituted for distilled water in the final rinse.
Supporting Reference Materials:
1. Minutiae Magazine, Summer Special 1994, Issue No. 24, pg.7.
2. "Chemical Formulas and Processing Guide for Developing Latent Prints", U.S. Dept. of Justice, pg. 47-48, 1994.
3. Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press, Boca Raton, FL., 2001.
4. Manual of Fingerprint Development Techniques 2nd. Ed., Home Office - Police Scientific Development Branch, White Crescent Press, Ltd., Luton, England, 2001.
5. Technical Notes, Lightning Powder Co. Inc., Salem, OR., 2001.

Return to: Main Page   ||  Non-Porous Surfaces  ||  Glass Surfaces  ||  Plastic Bag Surfaces  ||  Blood Enhancement Techniques  ]