Latent blood detection with fluorescein
Fluorescin(left), a non-fluorescent compound, reacts with iron in residual blood samples to produce highly fluorescent fluorescein(right).



The reference$\ce{^{[2]}}$ from which the following excerpt is taken describes the chemistry, preparation of reagents, and application to forensics.


  Fluorescin is the oxidized colorless form of fluorescein. Fluorescin reduced with hydrogen peroxide is immediately oxidized to fluorescein in the presence of blood-associated proteins and iron ion found in hemoglobin. Fluorescein fluoresces when viewed using blue light and orange or yellow filters, whereas fluorescin will not fluoresce under the same lighting conditions. 


Literature Resource

An excellent starting point to consider for searching for relevant literature is PubMed.

References


Image sources - PubChem
Google Books - Complete Crime Scene Investigation Handbook, Everett Baxter, Jr.
Latent-Prints.com - Fluorescein Detection of Latent Bloodstains
The Presumptive Reagent Fluorescein for Detection of Dilute Bloodstains and Subsequent STR Typing of Recovered DNA 
A Comparison of the Bluestar and Luminol Effectiveness in Bloodstain Detection