I could have saved myself a few quid and printed and cut out Mario images from the computer and told my guests not to eat the pictures, because this is exactly what I'll be doing tomorrow even though I followed the instructions to the LETTER! I left them out to air dry, 1 hour, no luck at peeling the back off. 2 hours later, no luck. 3 hours later...still no luck! I even tried the hairdryer technique. The back started to come off less than a millimeter at a time! 4 hours later they were too dry and just started to break into pieces. Despite this I have still put some on my son's cupcakes, because I know that he'll love the pictures but there is no way we'll be able to eat them; they'll be going in the bin along with the cupcake cases!