Fig. 1. Excitation spectrum (a), and emission spectrum (b) of three kinds of vegetable powders

Fig. 2. Fluorescence comparison of latent fingerprints on glass developed with broccoli powders and conventional luminescent powders
(a, a'): Conventional fluorescent powders; (b, b'): Broccoli powders

Fig. 3. Latent fingerprints photographed with optical methods
(a, a'): Smooth floor; (b, b'): Semi-smooth card; (c, c'): Bank card

Fig. 4. Latent fingerprints developed with broccoli powders on non porous substrates
(a, a'): Wood floor; (b, b'): Campus card; (c, c'): Aluminum foils; (d, d'): Plastic card; (e, e'): Cigarette case;(f, f'): ID card; (g, g'): Charger surface; (h, h'): Ceramic tiles; (i, i'): Plastic bottle cap

Fig. 5. Latent fingerprints developed with broccoli powders on porous substrates
(a, a'): RMB; (b, b'): Wrapping paper; (c, c'): A4 paper; (d, d'): Paper magazine