My son wants a science themed birthday party. Okie doke. Got ideas for a cake from this site. He has just also requested a blue cake. I bought white cake mix (DH) and was planning on using the cake extender recipe. How do I do this? Just add 1 egg white? The rest should be the same, right? Do I need a lot of food coloring to make the cake blue or just a little? Sorry, getting carried away with my questions. Really, I just want to know how to go about making it with the extender recipe. It seems simple, but sometimes I screw up the simple things. 
You shouldn't need too much. Blue is a pretty easy color to mix. Just add until you think it's about right. The color will deepen just a bit when it bakes, but not much. I would use liquid food coloring, that would work fine.
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