I need help with the reaction between fluorescein and blood in the method of detecting latent blood stains.
I find it hard to find any literature on this subject. As far as I am concerned, the fluorescein is reduced into fluorescin in a stock solution with powdered zinc, distilled water and sodium hydroxide pellets. $\ce{Fe^2+}$ (found in the latent blood) is oxidized into $\ce{Fe^3+}$ with hydrogen peroxide. When fluorescin is reacting with iron ions in the haemoglobin, it will be oxidized back to fluorescein.
Can anyone help me with this? Maybe even on a molecular level.