Note that marzipan can indeed be colored and often features rich hues such as reds and greens like in the delicious Italian cake, Cassata ... to use as a paste and mix them with the other ...
mix the icing until it holds stiff peaks. For piping, you want it a little thinner so it flows through the nozzle. It’s best to cover the cake with marzipan first so you don’t get crumbs in ...