I was watching a decorating competition on tv. They had 6 hours to make the decorations. some were royal icing that had hardened in less than that time. How do you make royal icing harden that quick. I am entering a timed competition this coming summer and need some info.
--Ken.
Put in a very low oven but be very careful the items don't scorch. I have had run outs ready to use in less than an hour with this method
I place my Royal icing in the oven to Dry. I set the heat at 200 F.
This won't help you with extra-large pieces, but for smaller pieces I use a food dehydrator. The company that makes my dehydrator has special craft trays that can be ordered separately. These trays don't have holes in the middle so you can dry larger flat pieces.
I also heard somewhere that adding a small amount of tylose will make royal dry very fast and stable. I tried this once, adding just a teeny bit of tylose to a batch of royal and the whole thing seized up quick. 
So I guess when they say use a small amount, they mean a really-really small amount. You'd have to experiment with that. 
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