Figure S1. TiO2 imaged by TEM and Gaussian particles size distribution histograms. (a) and (c) rutile 16 ± 3 nm particles, (b) and (d) anatase 134 ± 73 nm particles.

Figure S2. X-ray diffraction spectra of TiO2. (a) rutile, (b) anataise.

Figure S3. Cell aspect ratio for the CF-29 dermal fibroblasts. Samples with rutile unexposed and double exposed to CFL respectively and control; cell area (b) of dermal fibroblasts CF-29 samples with rutile unexposed and double exposed to CFL respectively and control.

Figure S4. (a) MTS results for the CF-29 cells 2 and 4 days after first exposure to CFL bulb, incandescent light bulb and control. After first exposure (2 days) incandescent bulb and CFL bulb; 4 days after first exposure incandescent bulb, CFL bulb; double exposed samples: incandescent and CFL bulb. (b–d) Confocal images of the cells exposed to different lighting. (b) Unexposed control, (c) double exposure to incandescent light bulb, (d) double exposure to CFL.

Table S1. Zeta-potential of TiO2 nanoparticles.

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