Just to add to the conversation, if you leave the margarine out of the RKT recipe it will keep much longer. I made a display cake using RKTs for some bansai tree “branches”. They’re all covered with modeling chocolate, so I have no idea what the RKTs look like under the modeling chocolate – but it has been well over a year and the cake still looks like it did on day one. I certainly wouldn’t eat it now, but you could still keep it as a keepsake.
Jenniffer White, Cup a Dee Cakes - http://cupadeecakes.blogspot.com
