Fig. 1. Schematic diagram of potential fingerprint display extraction based on AIE technology

Fig. 2. Analysis of fingerprinting effect and its gray value by different developing methods. (a) Fingerprint images, 6 detail characteristics, and gray analysis results using AIE microgrid spray technology; (b) fingerprint images, detail characteristics, and gray analysis results using fluorescent powder

Fig. 3. Development results of fingerprints on common objects. (a) True color developed images on different objects using AIE microgrid spray technology; (b) level 1‒3 features of fingerprint images on representative non permeable objects (white plastic bags, coins), as well as the grayscale values and grayscale ratios of the mastoid line and small furrow at the intersection of the white line; (c) level 1-3 features of fingerprint images on representative permeable objects (A4 paper, thermal paper), as well as the grayscale values and grayscale ratios of the mastoid line and small furrow at the intersection of white lines

Fig. 4. Variation in fluorescence intensity on objects with different roughness levels

Fig. 5. Development results of fingerprints on difficult objects. (a) True color developed images on difficult objects using AIE microgrid spray technology; (b) level 1-2 features of developed images on a black soft plastic bag and leather, and the grayscale value and grayscale ratio of the mastoid line and small furrow at the intersection of the white line

Fig. 6. Effect of in situ extraction of fingerprints on surgical masks and N95 masks

Fig. 7. Development results and grayscale values using AIE reagents with different storage times (above are fresh reagents, below are reagents stored for 90 days)