Will a chocolate cake show through grey fondant and what frosting should be used for the crumb coat?

Yes, a chocolate cake will likely show through grey fondant, especially if the fondant is thin or if the cake is very dark.

Here's why:

* Color Contrast: Grey is a neutral color, while chocolate is a rich brown. This strong contrast will make the brown cake color more noticeable through the grey fondant.

* Fondant Thinness: If the fondant is thin, it will be more translucent, allowing the cake's color to show through.

* Cake Darkness: Darker chocolate cakes will be more visible through the fondant than lighter cakes.

To minimize the chocolate showing through:

* Use a dark grey fondant: A darker grey will better mask the brown color of the cake.

* Use a thicker fondant: A thicker layer of fondant will be less translucent.

* Color the cake grey: You can dye the cake batter grey to match the fondant.

* Use a crumb coat: This is a thin layer of frosting applied to the cake before the fondant. It helps to seal in crumbs and create a smooth surface for the fondant to adhere to, which will help to prevent the cake from showing through.

Best frosting for a crumb coat:

* Buttercream frosting: It is easy to work with, and it provides a good barrier against the cake showing through.

* Ganache: It can be used for a crumb coat, but it can be difficult to work with, especially for beginners. It also has a tendency to be runny, so you may need to add more chocolate to thicken it.

Important Note: Even with a good crumb coat, some color from the cake may still show through the fondant, especially if the fondant is very thin. If you are concerned about this, consider using a different color for the fondant or using a different cake flavor that is less likely to show through.