DFO & Ninhydrin Fuming

DFO Fuming

DFO, 1,8 Diazafluoren-9-one, is a fluorescing ninhydrin analog found to develop up to two and a half more prints than ninhydrin itself. It is useful on porous surfaces, especially paper. Development may be accelerated through the application of controlled heat. Use it before ninhydrin. DFO also is useful to develop weak blood stains. It requires a specialized light source, such as the BLUEMAXX™, TMX200 or MMX300 alternate light sources. 

Ninhydrin Development

Ninhydrin reacts with amino acids to produce a purple reaction product called “Rhuemann’s Purple”. It is useful on porous surfaces—especially paper. Development time is up to 10 days, but may be accelerated through the application of heat and humidity. Use ninhydrin after iodine and before silver nitrate. Ninhydrin is not useful on items which have been exposed to water. 

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