Different bacterial colonies on NA plates usually seen only in white to yellow colour, but fungus colonies can be seen in different different colours with their different species. Why this difference can't be observed in bacterial colonies?
although many bacteria form white colonies, there are many that have a variety of colors such as yellow, red, orange, pale green, dark green for cyanobacteria etc. Those are just colors I have seen, but there are likely others as well. The colors are from the absorption spectrum of certain abundant molecules.