Does this change comprise of a mixture of bills and coins, or coins alone?

I have never used a higher denomination bill than $5 (our smallest note). However, the dispensers do not usually have a mechanism for dispensing notes at all. I recall seeing warning signs specifying a limit to how much change will be given (up to $10 so probably $2 coins) but this may have been at a machine dispensing transportation tickets rather than candy.

ETA: Do you guys over there seriously still not have notes that are colour coded? (Also, my friendly spell checker just picked up that I was trying to spell colour as 'color' which I found rather ironic. A pox on popular programming languages.)