Brite White and Angel White icing bases are different brands of the same product.
Here is a product blurb from sugarcraft explaining the usage:
www.sugarcraft.com/catalog/misc/icings.htm
If you're going to use an icing base, the next step usually is to use hi-ratio shortening rather than Crisco in your recipes.
However, I've found that hi-ratio and Crisco cannot be substituted 1:1. The hi-ratio though it doesn't have that Crisco greasy mouth feel, is simply more dense - it would be like replacing liquid creamer with heavy whipping cream.....
Threads on hi-ratio shortening:
http://www.cakecentral.com/cake-decorating-ftopict-44410.html
http://www.cakecentral.com/cake-decorating-ftopict-41674.html
HTH
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