asbestos warning sign

actinolite amosite anthophylite artwork asbestiform asbestos asbestosis background beware blue breathed caution chrysotile contaminated contamination crocidolite crystals danger dangerous fibres fibrils fibro fibrolite fibrous graphic green harmful hazard hazardblank hazardous health illustration isolated made mesothelioma microscopic minerals naturally notice occurring poison poisonous red risk safety set sign signage silicate six toxic toxicity toxin tremolite warn warning when white yellow