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Latent Print Examination » Questions from FP Experts for FP Experts... Processing, Testimony, and Technical Matters » Rapid Ninhydrin Development without Expensive or Dangerous Solvents « Previous Next »

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Webservant (Member)
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Post Number: 239
Registered: 03-1997
Posted on Wednesday, August 01, 2007 - 05:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

At the IAI's Annual Educational Conference during 22-28 Jul 2007 in San Diego, Hee-Il Lee (Korea's representative to the IAI) presented novel research about ninhydrin development without expensive or dangerous solvents.

Hee-IL Lee dissolved 5 grams of ninhydrin in one liter of distilled water using a magnetic stirrer, then put the aqueous ninhydrin solution in a normal steam iron and rapidly developed good-quality latent prints with the steam. Patent and other rights to this information are reserved by Hee-Il Lee.

Hee-Il Lee also designed a special steam generation chamber for more uniform development of aqueous ninhydrin solution latent prints on batches of documents (or other porous surface evidence). Patent and other rights to this information are reserved by Hee-Il Lee.

Hee-Il Lee's poster presentation about his research was well-received. Many of us are certainly looking forward to Hee-Il Lee's publication of the technique in the Journal of Forensic Identification.

MEMBERS OF THE GENERAL PUBLIC SHOULD NOT TRY THIS TECHNIQUE AT HOME! In that this is novel research, safety precautions concerning exposure to the ninhydrin-bearing steam should be discussed with laboratory safety representatives. Exposure to ninhydrin-steam may cause temporary purple discoloration (Ruhemann's purple) of your skin in some instances, and also may pose inhalation and other safety hazards.

Validation guidelines for novel Latent Print Examination techniques are posted at www.swgfast.org under the topic Validation of Research and Technology.

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