Answer:
I am sometimes referred to as chips
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I am all around yet to me you are half blind. Sunlight makes me invisible and difficult to find.
My first is in riddle but not in little. My second is in think but not in brink. My third is in thyme but not in time. My fourth is in mother but not in brother. My last is in time but no t in climb.
What color can you eat?
What an fill a room but takes up no space?