Holi colour 1 contains mould. a exhibits a photograph of a DG18 agar plate after inoculation with Holi colour 1 and incubation for 10 days at 25 °C. b–d displays microscopic images of different isolates of mould fungi (b Aspergillus sp., c unidentified Zygomycete species, d unidentified Paecilomyces/Bossychlamus species) found in Holi colour 1 (Magnification: 200×). Holi colours contain PM10 and can induce pro-inflammatory responses: Journal of Occupational Medicine and Toxicology (London, England). Not altered. CC.