blue
bowl
bright
circle
close up
colonies
colony
color
colorful
contaminated
contamination
danger
deterioration
develop
disease
disgust
experiment
fungi
fungus
germ
glass
green
growing
growth
infection
life
liquid
microbe
microbial
mold
mould
nobody
observation
orange
organism
paint
pattern
red
research
risk
science
spore
spread
structure
unhealthy
variation
white
white background