chemistry poison toxic substance toxic waste cans chemicals containers corroded disposal dump environmental hazard garbage hazardous hazardous waste pollutants pollution rubbish rust spill toxic trash waste advice alert appropriate behavior appropriate behaviour avoid black care concern danger dangerous denied directions not allowed not permitted permission denied polluted prohibited prohibition protect protection red rules safety sign signs toxicity warning warning sign water pollution water toxicity weathered white worn leaking old paint rusted announcement appropriate-behavior appropriate-behaviour be-careful beware caution communicating communication contaminated contamination deep health information informing not-allowed not-permitted permission-denied risk risks risky unhealthy warning-sign water water-pollution water-toxicity barrel drum environment autumn fauna fly agaric forest fungi grass mushroom nature plants wood green summer