Question: cake batter coloring
By: BRIAN
Published: February 24, 2011

I want to bake a red velvet cake BUT i want to make it blue, when i was a kid my mother tried to make me a blue one but it came out green. Can it be made blue?

Answers:
Rich Grant

Not likely. Think about it RGB is a pallette.  Red Green Blue. Using those 3 colors lets you make any other color.  And adding Blue to Red makes Green.
Since a Red Velvet cake is typically choclate base the red is easy to add.  I think you would have to add a LOT of blue and it would probably just have an ugly color.
Probably the best you could do is skip the red food coloring to add Blue frosting to a brown cake.
Kat

Blue Velvet Cake is often used for July 4th - type celebrations (you can make some seriously exciting flag cakes with it)... You just need a heap-load of blue food colouring to do it... http://cake0rdeath.blogspot.com/2009/07/red-white-and-blue-velvet-cake.html This is a post by Liz La Bau - I haven't tried it personally, but I trust her to get it right! :)