AHi everyone, this Saturday I'm making my sister in law her graduation cake and she wants a three tiered black cake... I don't want to color the butercream black because I think it's too much, the stains it leaves people, and just so much color for three tiers. (10,8,6) I was wondering has anyone else ever airbrushed black on white BC?? How many coats will it take? Will it work?? Please help! P.S I'm using americolors super black airbrush color

I have never airbrushed black but I've done purple and it does take a few coats.  I was using the purple spray color from Wilton.  You have to be careful with buttercream because any dings or dents in the icing that you make with your fingers or anything else will cause the white to show through.  If it were me I'd use fondant.  Duff makes a really good black fondant that doesn't get all hard and crusty.  It's expensive but with a coupon from Michael's it would save you some money.  Also you can roll it really thin. 

AI don't think fondant is my best friend just yet. But thank you any way.

It's easy!  Don't worry.  I did my first fondant cake a few months ago, and that's after decorating with buttercream for 15 years.  It's the pink castle cake in my gallery.  Just refrigerate your cake that's been coated with buttercream, so the icing is firm.  Then cover it.  It really is a lot easier than it looks!

Airbrushing "white" buttercream or fondant a true black probably isn't going to happen.

FDA pigments don't include a True Black and are made by combining approved colors - add to this absorption and PH shifts - and you can have some VERY unexpected results. Most "blacks" will have a decided color shift to dark green or brown, etc.

Additionally, the greater the color shift we try to achieve, the more product has to be applied. This can make for a very wet application if it is rushed - and the more pigment applied, the great a chance the pigment can affect flavor.