I would like to know if a laser toner cartridge have to be empty before I refill it. Since I ordered a toner bottle online and the description said it had to be empty.
I emptied the toner and then realised that there was huge amount of powder which came out.
I was thinking there was lot left and so why did I have to empty it?
I want to know that if laser toner cartridge is "empty" then if the then powder inside disappears while printing or if it's just a residue.