biohazard sign symbol warning black yellow triangle signage macro gray metal wall |
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| navigate by keyword : aged backdrop background banner bio biohazard biologic biological black brick cement closeup contamination design dirty environment forbidden frame graffiti graphic grunge hazard hazardous industrial label material metal old pattern poison poster prohibition restricted risk rough rusty sign slate stone substance symbol texture threat tile toxic urban vintage wall wallpaper warn warning |
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| Biohazard sign symbol biohazard warning, black yellow triangle signage macro on gray metal wall. |
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