acid
aged
background
brown
brush
chemical
chemistry
color
container
copper
corroded
corrosion
corrosive
crack
damage
danger
dangerous
dark
destroy
detail
dirty
factory
grunge
hazard
hazardous
industrial
industry
iron
label
material
metal
metallic
old
protection
reaction
red
risk
rough
rust
rusted
rusty
stain
steel
surface
symbol
vintage
warning
waste
worn